CN101257321B - Method and system for processing signal - Google Patents
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Abstract
Methods and systems for reducing AM/PM distortion in a polar amplifier are disclosed, comprising selecting the input frequency range of the voltage controlled oscillator based on a special wireless operation frequency band, wherein the system can process the first radio communication protocol and a second radio communication protocol. Based on the mixture of a plurality of signals received in the frequency range, for the special wireless operation frequency band, the image rejected mixer can generate the output signal; using the RC-CR quadrature network, the in-phase (I) and quadrature components of the output signals are generated.
Description
Technical field
The present invention relates to multi-standard system, more particularly, relate to a kind of method and system that is used for alleviating in the many phase-locked loops of multi-standard system the traction influence.
Background technology
For example employed bluetooth and WLAN radio transceiver device in the portable wireless terminal, operate in usually 2.4GHz (2.4000～2.4835GHz) industry, science, and medicine (ISM) exempt from the license frequency band.For example, employed other radio transceiver device in the cordless telephone also is operable in ISM and exempts from the license frequency band.Although the ISM frequency band is used for many short-distance wireless suitable low-cost solution is provided, when the multi-user operated simultaneously, it also had some shortcomings.For example, because the restriction of bandwidth for adapting to the communication protocol of multi-user and/or number of different types, needs to use frequency spectrum share.User in a plurality of uses also can cause the remarkable interference between the operating equipment.And in some instances, other equipment for example microwave oven also is operable in this frequency spectrum, also can produce significant interference or block signal, thereby influences bluetooth and/or WLAN transmission.
When in the wireless device for example when operation bluetooth wireless transceiver and WLAN wireless transceiver, have at least two kinds of different types of interference influences to take place.The first, when interference signal and desired signal appear in the transmission medium together, low signal and noise can take place add interference ratio (SINR).In this example, for example, Bluetooth signal can disturb WLAN signal or WLAN signal can disturb Bluetooth signal.Second influence can occur in when bluetooth and WLAN radio transceiver device when row puts side by side, when they are provided with very approachingly mutually, so that has little radio frequency (RF) path loss between their corresponding wireless front end receivers that is:.In this example, for example, the isolation between blue teeth wireless front end and the WLAN wireless front end can be little of 10dB.Therefore, wireless transceiver can reduce the transmission sensitiveness (desensitize) of the front end of another wireless transceiver.And because bluetooth adopts through-put power control, so the signal to noise ratio on Bluetooth link hour, row's bluetooth wireless transceiver of putting can improve its power level side by side, has further reduced the front end isolation between the wireless transceiver.Low noise amplifier in the wireless transceiver front end (LAN) is positioned at before the channel selection filter, and the signal in the ISM frequency band, for example arranges the signal of putting in the transmission side by side, is easy to make low noise amplifier to become saturated.This saturated sensitivity or sensitiveness of the receiver part of wireless transceiver front end of causing reduces, thereby reduces the ability of wireless transceiver detecting and demodulation desired signal.
Various technology have been developed, the low isolation problem that takes place between bluetooth that row arranged side by side puts in operating with the processing coexistence and the WLAN radio transceiver device.These technology can be utilized frequency and/or time quadrature mechanism, to reduce the interference between the radio transceiver device that row arranged side by side puts.And these technology are because so-called cooperation or non-cooperative mechanism in bluetooth and the WLAN radio transceiver device obtain, and wherein cooperate to be meant the direct communication between the agreement.For example, Bluetooth technology is utilized AFH (AFH), as frequency division multiplexing (FDM) technology, disturbs with minimum channel.In AFH, by the 79.1MHz interchannel in the micro bluetooth network, characterize physical channel with the pseudo-random hopping of per second 1600 frequency hopping rates.Bluetooth equipment uses the non-cooperative mechanism that AFH provided, and to avoid the Zhan Pin system, for example the frequency of wlan system takies.In this example, bluetooth wireless transceiver can based in the ISM frequency for example not by the frequency of other CU, revise its frequency-hopping mode.
Even when using frequency multiplexing technique, still significant interference can take place, this be since in the channel of isolating strong signal still as block signal, and the sensitiveness of reduction wireless front end receiver, that is: increased the noise level of receiver, so that can not clearly detect the signal that receives.For example, when the isolation between the radio transceiver device only was 10dB, side by side the WLAN wireless front end transmitter put of row generated the 15dBm signal, the high reject signal or the block signal of the blue-tooth radio equipment receiver that will put as row arranged side by side.Similarly, blue-tooth radio equipment is when sending, and the WLAN wireless device is when receiving, especially, when the blue teeth wireless front end transmitter operates in 20dBm grade 1 type, because the reduction of isolation between the wireless device, Bluetooth transmission will reduce the sensitiveness of WLAN wireless device receiver.
In wireless receiver and transmitter, use oscillator, so that frequency inverted to be provided, and the sine wave that is provided for modulating (sinusoidal) source.The exercisable frequency range of oscillator, from several KHz to several megahertzes, and can be tuning on a class frequency scope.Typical oscillator can use transistor and LC network, with the control frequency of oscillation.By regulating the value of LC resonator, tunable vibration frequency.If crystal is in the environment of Controllable Temperature, piezo-oscillator (XCO) can provide output frequency accurately.Phase-locked loop (PLL) can use feedback control circuit and reference source accurately, and for example piezo-oscillator has high-precision adjustable output to provide.Can provide accurately phase-locked loop and other circuit with the output of adjustable frequency to be called as frequency synthesizer.
Phase noise is the tolerance of definition of the frequency domain spectra of oscillator, and it is very important for many modern wireless systems, because it has seriously reduced the performance of wireless system.Phase noise can increase the noise level of receiver, has the local oscillator of noise can cause undesired closing on carried out frequency down-converts.This will limit the selection of receiver in the wireless communication system and the gap of adjacent channel.
The further part of this paper will be set forth the present invention in conjunction with the accompanying drawings.By system of the present invention and above-mentioned conventional system relatively, to one skilled in the art, the limitation of routine or legacy system and shortcoming are conspicuous.
Summary of the invention
A kind of method and/or system that is used for alleviating in the many phase-locked loops of multi-standard system the traction influence is described at least one accompanying drawing, and carried out complete explanation in the claims.
According to an aspect of the present invention, provide a kind of method of processing signals, this method may further comprise the steps:
Based on a specific wireless operational frequency bands in the system, select the incoming frequency scope of voltage controlled oscillator operation, described system can handle first wireless communication protocol and second wireless communication protocol;
Based on a plurality of signals that receive in the selected frequency range are mixed, for described specific wireless operational frequency bands generates output signal; With
Use at least one quadrature network, generate the homophase (I) and quadrature (Q) component of the described output signal that generates.
Preferably, described method also comprises: the output signal that cushions described voltage controlled oscillator.
Preferably, described method also comprises: the described output signal through buffering that first frequency dividing circuit is coupled to described voltage controlled oscillator.
Preferably, described method also comprises: first I component signal of the generation that described first frequency dividing circuit is exported and the first Q component signal of generation send at least one image-reject mixer.
Preferably, described method also comprises: with the be coupled first I component signal of described generation of described first frequency dividing circuit output of second frequency dividing circuit.
Preferably, described method also comprises: second I component signal of the generation that described second frequency dividing circuit is exported and the second Q component signal of generation send to described at least one image-reject mixer.
Preferably, described method also comprises: with the described output signal through buffering of described voltage controlled oscillator, with following at least one of them mix, to generate the described output signal of 802.11a radio operation frequency band: first I component signal of described generation and the second I component signal of described generation.
Preferably, described method also comprises: with the output signal corresponding to 802.11a radio operation frequency band of described generation, send to described at least one quadrature network.
Preferably, described method also comprises: the first Q component signal of the described generation that the three frequency division which couple is exported to described first frequency dividing circuit.
Preferably, described method also comprises: the 3rd I component signal of the generation that described three frequency division circuit is exported and the 3rd Q component signal of generation send to described at least one image-reject mixer.
Preferably, described method also comprises: the 3rd I component signal that divide by four circuit is coupled to the described generation of described three frequency division circuit output.
Preferably, described method also comprises: dummy load is coupled to the Q component output signal of described three frequency division circuit, and wherein said dummy load comprises the load that is equal to mutually with described divide by four circuit.
Preferably, described method also comprises: with the 4th I component signal of the generation of described divide by four circuit output and the 4th Q component signal of generation, send to described at least one image-reject mixer.
Preferably, described method also comprises: with the first I component signal of described generation, at least one of them mixes with the 3rd I component signal of described generation and the 3rd I component signal of described generation, to generate one of them described output signal of 802.11b and 802.11g radio operation frequency band.
Preferably, described method also comprises: with described through generating 802.11b and 802.11g radio operation frequency band one of them: described output signal, send to described at least one quadrature network.
Preferably, described at least one quadrature network comprises a plurality of resistance and electric capacity.
Preferably, described first wireless communication protocol is the Bluetooth wireless communication agreement.
Preferably, described second wireless communication protocol is a WLAN communication protocol.
Preferably, by being integrated in the circuit on the one chip, handle described first wireless communication protocol and described second wireless communication protocol.
Preferably, by the circuit on the separating chips, handle each in described first wireless communication protocol and described second wireless communication protocol.
According to an aspect of the present invention, provide a kind of system of processing signals, described system comprises:
One or more circuit are used for based on a specific wireless operational frequency bands, select the incoming frequency scope of voltage controlled oscillator operation; Described system can handle first wireless communication protocol and second wireless communication protocol;
At least one image-reject mixer is used for based on a plurality of signals that receive in the selected frequency range are mixed, for described specific wireless operational frequency bands generates output signal;
Described one or more circuit also is used to use at least one quadrature network, generates the homophase (I) and quadrature (Q) component of the described output signal that generates.
Preferably, described one or more circuit also is used to cushion the output signal of described voltage controlled oscillator.
Preferably, described one or more circuit also is used for first frequency dividing circuit is coupled to the described output signal through buffering of described voltage controlled oscillator.
Preferably, described one or more circuit also are used for, and with first I component signal of the generation of described first frequency dividing circuit output and the first Q component signal of generation, send at least one image-reject mixer.
Preferably, described one or more circuit also is used for second frequency dividing circuit is coupled to the described first I component signal through generating of described first frequency dividing circuit output.
Preferably, described one or more circuit also are used for, and with second I component signal of the generation of described second frequency dividing circuit output and the second Q component signal of generation, send at least one image-reject mixer.
Preferably, described at least one image-reject mixer is used for the described output signal through buffering with described voltage controlled oscillator, with following at least one of them mix, to generate the described output signal of 802.11a radio operation frequency band: the described first I component signal and the described second I component signal through generating through generating.
Preferably, described one or more circuit are used for the output signal with the described generation of 802.11a radio operation frequency band, send to described at least one quadrature network.
Preferably, described one or more circuit is used for the first Q component signal of described generation that the three frequency division which couple is exported to described first frequency dividing circuit.
Preferably, described one or more circuit are used for the 3rd I component signal of generation that described three frequency division circuit is exported and the 3rd Q component signal of generation, send to described at least one image-reject mixer.
Preferably, described one or more circuit is used for divide by four circuit is coupled to the I component signal of the described generation that described three frequency division circuit exported.
Preferably, described one or more circuit are used for the 4th I component signal of generation that described divide by four circuit is exported and the 4th Q component signal of generation, send to described at least one image-reject mixer.
Preferably, described image-reject mixer is used for the first I component signal with described generation, described through generating the 3rd I component signal and described the 4th I component signal through generating with one of them mixes at least, with one of them described output signal of generation 802.11b and 802.11g radio operation frequency band.
Preferably, described one or more circuit be used for described through generate following one of them: the described output signal of 802.11b and 802.11g radio operation frequency band sends to described at least one quadrature network.
Preferably, described at least one quadrature network comprises a plurality of resistance and electric capacity.
Preferably, described first wireless communication protocol is the Bluetooth wireless communication agreement.
Preferably, described second wireless communication protocol is a WLAN communication protocol.
Preferably, by being integrated in the circuit on the one chip, handle described first wireless communication protocol and described second wireless communication protocol.
Preferably, by the circuit on the separating chips, handle each in described first wireless communication protocol and described second wireless communication protocol.
By following description and accompanying drawing, can more in depth understand various advantage of the present invention, various aspects, character of innovation, and the details of embodiment.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Figure 1A is the structured flowchart about employed exemplary phase-locked loop in one embodiment of the invention;
Figure 1B is the structured flowchart according to the exemplary single wireless chip of support WLAN of one embodiment of the invention and blue teeth wireless operation;
Fig. 2 A is the structured flowchart about the exemplary local oscillator generator of employed Bluetooth wireless communication system in one embodiment of the invention;
Fig. 2 B is the structured flowchart according to the exemplary local oscillator generator of the Wireless LAN communication system of one embodiment of the invention;
Fig. 3 is the structured flowchart according to the exemplary local oscillator generator architecture of the multi-standard wireless communication system of one embodiment of the invention;
Fig. 4 A is about using the structured flowchart of straight frequency conversion receiver in one embodiment of the invention;
Fig. 4 B is the structured flowchart about employed exemplary RC-CR quadrature network in one embodiment of the invention.
Embodiment
Specific embodiment of the present invention relates to the method and system that is used to alleviate the traction influence in a kind of multi-standard system in many phase-locked loops.Some aspects of this method and system comprise: based on a specific radio operation frequency band in the system, select the incoming frequency scope of voltage controlled oscillator operation, wherein this system handles first wireless communication protocol and second wireless communication protocol.Based on a plurality of signals that receive in the selected frequency range are mixed, image-reject mixer can be a specific radio operation frequency band and generates an output signal.Can use the RC-CR quadrature network to produce homophase (I) component and quadrature (Q) component of the output signal that is generated.
Figure 1A is the structured flowchart about employed exemplary phase-locked loop in one embodiment of the invention.Shown in Figure 1A, phase-locked loop (PLL) 100 comprises reference oscillator 102, phase detector (phase detector) 104, ring amplifier 106, ring wave filter 108, voltage controlled oscillator (VCO) 110, reaches frequency divider 112.
Figure 1B is the structured flowchart according to the exemplary single wireless chip of support WLAN of one embodiment of the invention and blue teeth wireless operation.Shown in Figure 1B, mobile phone 150 can comprise WLAN/ Bluetooth coexistence antenna system 152 and one chip WLAN/ bluetooth (WLAN/BT) radio transceiver device 154.One chip WLAN/BT radio transceiver device 154 can comprise WLAN wireless transceiver part 156 and bluetooth wireless transceiver part 158.For example, one chip WLAN/BT radio transceiver device 154 can be implemented based on chip in the system (SOC) architecture.
WLAN/ Bluetooth coexistence antenna system 152 can comprise suitable hardware, logic and/or circuit, so that WLAN and the Bluetooth communication between external equipment and the coexistence terminal to be provided.This WLAN/ Bluetooth coexistence antenna system 152 can comprise at least one antenna that is used to send and receive WLAN and bluetooth data packets flow.
WLAN wireless transceiver part 156 can comprise suitable logic, circuit and/or code, to handle WLAN protocol data bag, to communicate.WLAN wireless transceiver part 156 can send and/or receive WLAN protocol data bag and/or information by single each transmission/reception (Tx/Rx) port.In some instances, transmit port (Tx) can separate realization with receiving port (Tx).WLAN wireless transceiver part 156 also can generate signal, with the operation of control at least a portion WLAN/ Bluetooth coexistence antenna system 152.For example, can use the firmware that operates in the WLAN wireless transceiver part 156, with scheduling and/or control WLAN data packet communication.
WLAN wireless transceiver part 156 also can receive and/or send priority signal 160.Can use the co-operation of these priority signal 160 scheduling and/or control WLAN wireless transceiver part 156 and bluetooth wireless transceiver part 158.In this respect, priority signal 160 can comprise a plurality of signals, to realize different transmission priorities.For example, the implementation that single signal implementation can obtain 2 transmission priorities, 2 signals can realize nearly 4 different transmission priorities, and the implementation of 3 signals can realize up to 8 different transmission priorities.
Bluetooth wireless transceiver part 158 can comprise suitable logic, circuit and/or code, to handle the Bluetooth communication protocol packet, to communicate.Bluetooth wireless transceiver part 158 can be passed through single transmission/reception (Tx/Rx) port, with WLAN/ Bluetooth coexistence antenna system, carries out the exchange of Bluetooth protocol packet and/or information.In some instances, transmit port (Tx) can separate realization with receiving port (Rx).Blue teeth wireless part 158 also can generate signal, with the operation of control at least a portion WLAN/ Bluetooth coexistence antenna system 152.Can use the firmware scheduling and/or the control blue-teeth data packet communication that operate in the bluetooth wireless transceiver part 158.Bluetooth wireless transceiver part 158 also can receive and/or send priority signal 160.By common logic, circuit and/or code, can carry out the part operation that WLAN wireless transceiver part 156 is supported, and the part that bluetooth wireless transceiver part 158 is supported is operated.
In some instances, at least a portion of WLAN wireless transceiver part 156 or bluetooth wireless transceiver part 158 is (disabled) that lost efficacy, and wireless terminal is operable in the single communication pattern, that is: coexistence was lost efficacy.When at least a portion of WLAN wireless transceiver part 156 lost efficacy, WLAN/ Bluetooth coexistence antenna system 152 can be used default setting, to support Bluetooth communication.When at least a portion of bluetooth wireless transceiver part 158 lost efficacy, WLAN/ Bluetooth coexistence antenna system 152 can be used default setting, to support WLAN communication.
Fig. 2 A is the structured flowchart about the exemplary local oscillator generator of employed Bluetooth wireless communication system in one embodiment of the invention.Shown in Fig. 2 A, bluetooth local oscillator (LO) generator 200 can comprise VCO202, frequency mixer 204 and divide-by-two circuit 206.
VCO202 can comprise suitable logic, circuit and/or code, and generating output frequency, it is many times of reference oscillator frequencies.VCO202 is operable in, and for example about 1601.3MHz is to the frequency range of 1656MHz, to carry out Bluetooth operation.The second harmonic of the signal that VCO202 generated can, for example 3202.6MHz is to the frequency range of 3312MHz.
Divide-by-two circuit 206 can comprise suitable logic, circuit and/or code, and the homophase (I) and quadrature (Q) component of the signal that receives with generation, and the output I and the Q component that are generated are to send to frequency mixer 204.Divide-by-two circuit 206 can carry out frequency division to the input signal that receives, and generates half output signal of frequency with the input signal that receives.Frequency mixer 204 can comprise suitable logic, circuit and/or code, thus the frequency that will be received from the signal of VCO202 and divide-by-two circuit 206 mix, and generate output signal, to send to transmitter or receiver.This output signal can, for example approximately 2402MHz to the frequency range of 2484MHz, to carry out Bluetooth operation.
Fig. 2 B is the structured flowchart according to the exemplary local oscillator generator of the Wireless LAN communication system of one embodiment of the invention.VCO252 is shown and is used for local oscillator (LO) generator 250 that WLAN (WLAN) is operated as Fig. 2 B.LO generator 250 can comprise VCO buffer 254, a plurality of frequency mixer 256,258,266 and 268, a plurality of divide-by-two circuit 260,262 and 264 and a plurality of buffer 270,271,272,273 and 274.
VCO252 can comprise suitable logic, circuit and/or code, and to generate output frequency, this frequency is many times of reference oscillator frequencies.VCO252 is operable in, and for example approximately 3280MHz operates to carry out WLAN to the frequency range of 3933.3MHz.This VCO buffer 254 can comprise suitable logic, circuit and/or code, is received from the signal of VCO254 with buffering and/or storage.
A plurality of divide-by-two circuits 260,262 and 264 can comprise suitable logic, circuit and/or code, and the homophase (I) and quadrature (Q) component of the signal that receives with generation, and the output I and the Q component that are generated are to send to a plurality of frequency mixers.Divide-by-two circuit 260 can carry out frequency division with the frequency that is received from the input signal of VCO252, and generates half output signal of frequency with received input signal.For example, the I of the output signal that divide-by-two circuit 260 is generated and the frequency range of Q component are approximately, and for example 1640MHz is to 1966.7MHz.Divide-by-two circuit 262 can carry out frequency division with the frequency of I component that is received from the output signal of divide-by-two circuit 260, and generates half output signal of frequency with received signal.For example, the I of the output signal that divide-by-two circuit 262 is generated and the frequency range of Q component are approximately, and for example 804MHz is to 828MHz.Divide-by-two circuit 264 is virtual circuit (dummy circuit), and it can receive the Q component of the signal that divide-by-two circuit 260 exported.The Q component that divide-by-two circuit 260 is generated can be coupled to has dummy load or the divide-by-two circuit 264 that negative power consumes.Thereby the symmetry that can obtain divide-by-two circuit 260 loads, and optimum I-Q coupling.
A plurality of frequency mixers 256,258,266 and 268 can comprise suitable logic, circuit and/or code, the frequency that is received from the signal of VCO252 and corresponding divide-by-two circuit is mixed, generating a plurality of output signals, and send to a plurality of buffers 270,271,273 and 274.For example, frequency mixer 256 can mix the frequency that is received from the signal of VCO252 with the frequency of the I component of the signal that is received from divide-by-two circuit 260, with the generation output signal, and sends to buffer 270.Frequency mixer 258 can mix the frequency that is received from the signal of VCO252 with the frequency of the Q component of the signal that is received from divide-by-two circuit 260, with the generation output signal, and send to buffer 271.Frequency mixer 266 can mix the frequency that is received from the signal of VCO252 with the frequency of the I component of the signal that is received from divide-by-two circuit 262, with the generation output signal, and send to buffer 273.Frequency mixer 268 can mix the frequency that is received from the signal of VCO252 with the frequency of the Q component of the signal that is received from divide-by-two circuit 262, with the generation output signal, and send to 274.Buffer 272 can receive the I and the Q component of the signal of divide-by-two circuit 260 outputs, with the generation output signal, and sends to PLL.Send to PLL the output signal frequency scope can, for example 1640MHz is to 1966.7MHz.
VCO252 for example operates in frequency range, is approximately 3280MHz to 3933.3MHz, to be used for the WLAN operation.The scope of the second harmonic that VCO202 generated can be, and for example the about 3206.6MHz of frequency range is to 3312MHz, to carry out Bluetooth operation.In the chip of handling WLAN communication protocol and Bluetooth communication protocol, because the interference of the frequency of the signal that VCO202 and VCO252 generated, VCO252 can be subjected to the traction (pull) of the second harmonic that VCO202 generates.Divide-by-two circuit 260 can generate the I and the Q component of output signal, and this output signal frequency scope is approximately 1640MHz to 1966.7MHz.Similarly, because the frequency interferences of the signal that VCO202 and divide-by-two circuit 260 are generated, VCO202 can be subjected to the traction of the output of divide-by-two circuit 260.
Fig. 3 is the structured flowchart according to the exemplary local oscillator generator architecture of the multi-standard wireless communication system of one embodiment of the invention.Fig. 3 illustrates VCO302, buffer 304, processor 310 and LO generator 300.LO generator 300 can comprise VCO buffer 306, a plurality of image-reject mixer 314 and 324, a plurality of divide-by-two circuit 308,312,318,320 and 322, a plurality of buffer 316 and 328, a plurality of RC circuit 330,332,334 and 336, a plurality of last level buffer 338,339,340,341,342,343,344 and 345.
VCO302 can comprise suitable logic, circuit and/or code, and generating output frequency, it is many times of reference oscillator frequencies.VCO302 is operable in a plurality of frequency ranges.For example, VCO 302 can operate in the first frequency scope f1 between the 3936MHz-4000MHz under four frequency division patterns
VCOIn, the reference frequency output f1 of formation range between 4920MHz-5000MHz
Out, f1 wherein
Out=f1
VCO* 5/4; Also can under secondary frequency division pattern, operate in the second frequency scope f2 between the 3346.7MHz-3933.3MHz
VCOIn, the reference frequency output f2 of formation range between 5020MHz-5900MHz
Out, f2 wherein
Out=f2
VCO* 3/2; Also can under secondary frequency division pattern, operate in the 3rd frequency range f3 between the 3280MHz-3933.3MHz
VCOIn, the reference frequency output f3 of formation range between 4920MHz-5900MHz
Out, f3 wherein
Out=f3
VCO* 3/2, be used to carry out the WLAN operation of 802.11a frequency band.VCO 302 can operate in the 4th frequency range f4 between the 3859.2MHz-3974.4MHz under eight frequency division patterns
VCOIn, the reference frequency output f4 of formation range between 2412MHz-2484MHz
Out, f1 wherein
Out=f4
VCO* 5/8; Also can under four frequency division patterns, operate in the 5th frequency range f5 between the 3216MHz-3312MHz
VCOIn, the reference frequency output f5 of formation range between 2412MHz-2484MHz
Out, f5 wherein
Out=f5
VCO* 3/4, be used to carry out the WLAN operation of 802.11b/g frequency band.Buffer 304 can receive the signal from VCO302, and the output of the generation frequency range identical with VCO302, sends to PLL.
Divide-by-two circuit 308 can carry out frequency division to the frequency of the input signal that is received from VCO302, and generates half output signal of frequency with received input signal.For example, divide-by-two circuit 308 can be at VCO scope f1 under four frequency division patterns
VCOInterior formation range at 1968MHz to the frequency range f1 between the 2000MHz
CHThe I and the Q component of interior output signal are used to carry out 802.11a frequency band WLAN operation.Divide-by-two circuit 308 can be under secondary frequency division pattern is f2 in the VCO scope
VCOInterior formation range at 1673MHz to the frequency range f2 between the 1967MHz
CHThe I and the Q component of interior output signal are used to carry out 802.11a frequency band WLAN operation.Divide-by-two circuit 308 can be at VCO scope f3 under secondary frequency division pattern
VCOInterior formation range at 1640MHz to the frequency range f3 between the 1967MHz
CHThe I and the Q component of interior output signal are used to carry out 802.11a frequency band WLAN operation.Divide-by-two circuit 308 can be at VCO scope f4 under eight frequency division patterns
VCOInterior formation range at 1930MHz to the frequency range f4 between the 1987MHz
CHThe I and the Q component of interior output signal are used to carry out 802.11b/g frequency band WLAN operation.Divide-by-two circuit 308 can be at VCO scope f5 under four frequency division patterns
VCOInterior formation range at 1608MHz to the frequency range f5 between the 1656MHz
CHThe I and the Q component of interior output signal are used to carry out 802.11b/g frequency band WLAN operation.
Divide-by-two circuit 312 can carry out frequency division with the I component that is received from the signal that divide-by-two circuit 308 exported, and generates half output signal of frequency with received input signal.For example, divide-by-two circuit 312 can be at VCO scope f1 under four frequency division patterns
VCOInterior formation range at 984MHz to the frequency range f1 between the 1000MHz
CH2The I and the Q component of interior output signal are used to carry out 802.11a frequency band WLAN operation.
Divide-by-two circuit 318 can carry out frequency division with the Q component that is received from the signal that divide-by-two circuit 308 exported, and generates half output signal of frequency with received input signal, to be used to carry out 802.11b/g frequency band WLAN operation.For example, divide-by-two circuit 318 can be at VCO scope f4 under eight frequency division patterns
VCOThe frequency range f4 of interior formation range between 965MHz-994MHz
CH2The I and the Q component of interior output signal.For example, divide-by-two circuit 318 can be at VCO scope f5 under four frequency division patterns
VCOThe frequency range f5 of interior formation range between 804MHz-828MHz
CH2The I and the Q component of interior output signal.Divide-by-two circuit 322 can carry out frequency division with the I component that is received from the signal that divide-by-two circuit 318 exported, and generates half output signal of frequency with received input signal, to be used to carry out 802.11b/g frequency band WLAN operation.For example, divide-by-two circuit 322 can be at f4 under eight frequency division patterns
VCOIn the VCO scope formation range at 482MHz to the frequency range f4 between the 497MHz
CH3The I and the Q component of interior output signal are used to carry out 802.11b/g frequency band WLAN operation, and its frequency range is approximately.
Divide-by-two circuit 320 is virtual circuits, and can receive the Q component of the signal of divide-by-two circuit 318 outputs.The Q component that divide-by-two circuit 318 is generated can be coupled to has dummy load or the divide-by-two circuit 320 that negative power consumes.Thereby the symmetry that can obtain divide-by-two circuit 318 loads, and optimum I-Q coupling.This dummy load comprises the load that is equal to mutually with divide-by-two circuit 322.
Can load divide-by-two circuit 308 symmetrically.For example, the I component of divide-by-two circuit 308 can be coupled to divide-by-two circuit 312 and a plurality of image-reject mixer 314 and 324.Similarly, the Q component of divide-by-two circuit 308 can be coupled to divide-by-two circuit 318 and a plurality of image-reject mixer 314 and 324.
Image-reject mixer 314 can comprise suitable logic, circuit and/or code, thereby the frequency that will be received from the signal of at least one in VCO302 and a plurality of divide-by-two circuit 308 and 312 is mixed, with the generation output signal, and send to buffer 316.Image-reject mixer 314 can be by differently handling with mirror image to the received signal, thus the undesired mirror image of blanketing frequency.Image-reject mixer 314 can receive the I and the Q component of a plurality of divide-by-two circuits 308 and 312 output signals that generate.Image-reject mixer 314 can to generate output signal, be used to carry out the frequency band of specific wireless operation based on a plurality of signals that receive in the selected scope are mixed.Buffer 316 can generate the buffering output of the signal that is received from image-reject mixer 314, to send to a plurality of RC circuit 330 and 332.At least one in a plurality of signals of a plurality of divide-by-two circuits 308 and 312 of baseband processor 310 optionally connected receipts.For example, image-reject mixer 314 can be received from the frequency of VCO buffer 306, the I of signal that is received from divide-by-two circuit 308 and Q component frequency one of them and be received from the I of signal of divide-by-two circuit 312 and the frequency of Q component, mix, with the generation output signal, and send to buffer 316.
Image-reject mixer 324 can comprise suitable logic, circuit and/or code, thereby will be received from least one the frequency of signal in secondary mixing circuit 308 and a plurality of divide-by-two circuit 318 and 322, mix,, and send to buffer 328 with the generation output signal.Image-reject mixer 324 can be by carrying out different processing with mirror image, with the undesired mirror image of blanketing frequency to the received signal.Image-reject mixer 324 can receive the I and the Q component of a plurality of divide-by-two circuits 308,318 and 322 output signals that generated.Image-reject mixer 324 can be used to carry out the frequency band of specific wireless operation based on a plurality of signals that receive in the selected frequency range are mixed.Buffer 328 can generate a buffering output, and send to a plurality of RC circuit 324 and 336 being received from the signal of image-reject mixer 324.Baseband processor 310 can be selected at least one from a plurality of signals that receive, these a plurality of signals that receive are by a plurality of divide-by-two circuits 318 and 322 outputs.For example, image-reject mixer 324 can will be received from one of them in the frequency of the frequency of the I of signal of divide-by-two circuit 308 and Q component, the I of signal that is received from divide-by-two circuit 318 and Q component and be received from the I of signal of divide-by-two circuit 322 and the frequency of Q component, mix, with the generation output signal, and send to buffer 328.
A plurality of RC circuit 330 and 332 can comprise suitable logic, circuit and/or code, thereby can be shifted by phase place to the signal that is received from buffer 316, with I and the Q component that generates received signal, and send to a plurality of last level buffers 338,339,340 and 341.A plurality of last level buffer 338,339,340 and 341 scalable signals, generation output, and send to transmitter/receiver, to be used for 802.11a frequency band WLAN operation.Under four frequency division patterns at VCO scope f1
VCOIn, a plurality of last level buffers 338,339,340 and the I of 341 output signals that generated and the frequency range f1 of frequency between 4920MHz-5000MHz of Q component
OUTIn, be used to carry out 802.11a frequency band WLAN operation.Under secondary frequency division pattern at VCO scope f2
VCOIn, a plurality of last level buffers 338,339,340 and the I of 341 output signals that generated and the frequency range f2 of frequency between 5020MHz-5900MHz of Q component
OUTIn, be used to carry out 802.11a frequency band WLAN operation.Under secondary frequency division pattern at VCO scope f3
VCOIn, a plurality of last level buffers 338,339,340 and the I of 341 output signals that generated and the frequency range f3 of frequency between 4920MHz-5900MHz of Q component
OUTIn, be used to carry out 802.11a frequency band WLAN operation.
A plurality of RC circuit 334 and 336 can comprise suitable logic, circuit and/or code, thereby can be shifted by phase place to the signal that is received from buffer 328, with I and the Q component that generates received signal, and send to a plurality of last level buffers 342,343,344 and 345.A plurality of last level buffer 342,343,344 and 345 scalable signals, generation output, and send to transmitter/receiver, to be used to carry out 802.11b/g frequency band WLAN operation.Under eight frequency division patterns at VCO scope f4
VCOIn, a plurality of last level buffers 342,343,344 and the I of 345 output signals that generated and the frequency range f4 of frequency between 2412MHz-2484MHz of Q component
OUTIn, be used to carry out 802.11b/g frequency band WLAN operation.Under four frequency division patterns at VCO scope f5
VCOIn, a plurality of last level buffers 342,343,344 and the I of 345 output signals that generated and the frequency range f5 of frequency between 2412MHz-2484MHz of Q component
OUTIn, be used to carry out 802.11b/g frequency band WLAN operation.
In handling the chip that WLAN connects with bluetooth is connected, baseband processor 310 can be passed through based on a specific wireless operational frequency bands, 802.11a/b/g radio operation frequency band is for example selected the opereating specification of VCO302 incoming frequency, avoids the traction to VCO302 of second harmonic that VCO202 generates with this.Similarly, the I and the Q component of the output signal that divide-by-two circuit 308 is generated, its frequency range is approximately 1673.3MHz to 1966.7MHz, can not disturb with the frequency coherence of the signal that VCO202 generated that operates in the Bluetooth operation pattern.
Fig. 4 A is about using the structured flowchart of straight frequency conversion (direct-conversion) receiver in one embodiment of the invention.Fig. 4 A illustrates amplifier 402, a plurality of frequency mixer 404 and 406, a plurality of low pass filter 412 and 414, a plurality of linear gain amplifier 416 and 420, a plurality of power detector 418 and 422, phase splitter 408 and phase-locked loop (PLL) 410.
But amplifier 402 receiving inputted signals and generating, and send to a plurality of frequency mixers 404 and 406 through amplified output signal.A plurality of mixing rates 404 and 406 can flow down analog RF and be converted to base band.Phase splitter 408 can determine whether to guarantee that the input of frequency mixer local oscillator is a quadrature, and promptly they have differing of 90 degree each other.For example, selectively, can carry out the just phase shift of (+) 45 degree, another path be born the phase shift of (-) 45 degree a path.Phase-locked loop 410 can drive input of frequency mixer local oscillator and phase splitter 408.A plurality of low pass filters 412 and 414 can carry out filtering to the received signal, so that the desired frequency channel is provided.A plurality of linear gain amplifiers 416 and 420 can keep constant amplitude to the received signal, and can be controlled by a plurality of power detectors 418 and 422, thereby generate the I and the Q component of the signal that receives.
Fig. 4 B is the structured flowchart about employed exemplary RC-CR quadrature network in one embodiment of the invention.RC-CR quadrature network 450 shown in Fig. 4 B, it comprises RC circuit 451, CR circuit 455 and ground (GND) 460.RC circuit 451 can comprise resistance R 452 and capacitor C 454.CR circuit 455 can comprise resistance R 458 and capacitor C 456.
Input V
InCan be sinusoidal input signal with frequencies omega.RC circuit 451 with R452 and C454 can generate phase shift output V
Out1(t), it equals pi/2-tan
-1(RC ω).CR circuit 455 with R458 and C456 can generate phase shift output V
Out2(t), it equals-tan
-1(RC ω).V
Out1And V
Out2All have differing of 90 degree in all frequencies.Output signal V
Out1And V
Out2Amplitude equal ω=1/ (RC).The signal V that can use RC-CR quadrature network 450 to receive with generation
InI and Q component.
According to one embodiment of the invention, be used to alleviate the method and system of traction influence in a kind of multi-standard system in many phase-locked loops, it comprises based on a specific wireless operational frequency bands, and 802.11a/b/g radio operation frequency band is for example selected the incoming frequency scope of voltage controlled oscillator (VCO) 302 operations.Image-reject mixer 314 or 324 can generate output signal, to be used for specific radio operation frequency band, for example 802.11a/b/g radio operation frequency band based on a plurality of signals that receive in the selected frequency range are mixed.For 802.11a radio operation frequency band, use RC- CR quadrature network 330 and 332, can generate homophase (I) component and quadrature (Q) component of the output signal that is generated.Similarly,, use RC- CR quadrature network 334 and 336, can generate the I component and the Q component of the output signal that is generated for 802.11b/g radio operation frequency band.
The three frequency division circuit, for example divide-by-two circuit 318, can be coupled to from first frequency dividing circuit, and for example divide-by-two circuit 312, the Q component signal that is generated.From the three frequency division circuit, for example divide-by-two circuit 318, and the 3rd I component signal that is generated and the 3rd Q component signal that is generated can send to image-reject mixer 324.Divide by four circuit, for example divide-by-two circuit 322, can be coupled to from the three frequency division circuit, and for example divide-by-two circuit 318, the 3rd I component signal that is generated.Dummy load, for example divide-by-two circuit 320, can be coupled to the Q component output signal of three frequency division circuit, and divide-by-two circuit 318 and dummy load can comprise and divide by four circuit that for example divide-by-two circuit 322, the load that is equal to mutually.From divide by four circuit, for example divide-by-two circuit 322, and the 4th I component signal that is generated and the 4th Q component signal that is generated can send to image-reject mixer 324.Image-reject mixer 324 can with the first I component signal through generating with following at least one of them: the 3rd I component signal of generation and generation the 4th I component signal, mix, to generate output signal, be used for following at least one of them: 802.11b and 802.11g radio operation frequency band.For following at least one of them: 802.11b and 802.11g radio operation frequency band, the output signal that is generated can send to the RC-CR quadrature network with RC circuit 334 and 336, to generate the I and the Q component of corresponding output signal.
First wireless communication protocol can be the Bluetooth wireless communication agreement.Second wireless communication protocol can be WLAN communication protocol.Can be by the circuit that is integrated into one chip, for example one chip WLAN/BT radio transceiver device 154 is handled first wireless communication protocol and the second WLAN communication protocol.In another embodiment of the present invention, can be located at circuit on the different chips by branch, handle each in first wireless communication protocol and the second communication wireless protocols.
Another embodiment of the present invention, a kind of machine readable memory is provided, storage is by computer program on it, this computer program has at least one can influence step to cause that this machine is carried out to be used for as described above alleviating in the many phase-locked loops of multi-standard system drawing by the code segment of machine execution.
The present invention can pass through hardware, software, and perhaps soft, combination of hardware realizes.The present invention can realize with centralized system at least one computer system, perhaps be realized with dispersing mode by the different piece in the computer system that is distributed in several interconnection.Anyly can realize that the computer system of described method or miscellaneous equipment all are applicatory.The combination of software and hardware commonly used can be the general-purpose computing system that computer program is installed, and by installing and carry out described program-con-trolled computer system, it is moved by described method.In computer system, utilize processor and memory cell to realize described method.
The present invention can also implement by computer program, and described program comprises whole features that can realize the inventive method, when it is installed in the computer system, by operation, can realize method of the present invention.Computer program in the present specification refers to: one group of any expression formula of instructing that can adopt any program language, code or symbol to write, this instruction group makes system have information processing capability, with direct realization specific function, or after carrying out following one or two step, a) convert other Languages, coding or symbol to; B) reproduce with different forms, realize specific function.
The present invention is described by some embodiment, and those skilled in the art know, under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes or equivalence replacement to these features and embodiment.In addition, under instruction of the present invention, can make amendment to these features and embodiment can not break away from the spirit and scope of the present invention to adapt to concrete situation and material.Therefore, the present invention is not subjected to the restriction of specific embodiment disclosed herein, and all interior embodiment of claim scope that fall into the application belong to protection scope of the present invention.
Claims (2)
1. the method for a processing signals is characterized in that, may further comprise the steps:
Based on a specific wireless operational frequency bands in the system, select the incoming frequency scope of voltage controlled oscillator operation, described system can handle first wireless communication protocol and second wireless communication protocol;
According to the incoming frequency scope of required reference frequency output and voltage controlled oscillator operation, select the frequency division setting of local oscillator generator;
The output signal of the described voltage controlled oscillator of buffer buffers;
First frequency dividing circuit is coupled to described output signal through buffering, and first homophase (I) component signal of the generation that described first frequency dividing circuit is exported and first quadrature (Q) component signal of generation send at least one image-reject mixer so that described output signal is carried out down-conversion;
And/or second frequency dividing circuit is coupled to the first I component signal of the described generation of described first frequency dividing circuit output, virtual frequency dividing circuit is coupled to the first Q component signal of the described generation of described first frequency dividing circuit output, and the second I component signal of the generation that described second frequency dividing circuit is exported and the second Q component signal of generation send at least one image-reject mixer so that described output signal is carried out down-conversion;
Image-reject mixer mixes a plurality of signals that receive in the selected frequency range, for described specific wireless operational frequency bands generates output signal;
With use at least one RC-CR quadrature network, the I and the Q component of the output signal that generates described image-reject mixer respectively and generated.
2. the system of a processing signals is characterized in that, comprising:
One or more circuit are used for the one specific wireless operational frequency bands based on system, select the incoming frequency scope of voltage controlled oscillator operation, and described system can handle first wireless communication protocol and second wireless communication protocol;
Baseband processor is used for the incoming frequency scope according to required reference frequency output and voltage controlled oscillator operation, selects the frequency division setting of local oscillator generator;
Image-reject mixer is used for a plurality of signals that receive in the selected frequency range are mixed, for described specific wireless operational frequency bands generates output signal;
Buffer is used to cushion the output signal of described voltage controlled oscillator;
Described one or more circuit also is used for first frequency dividing circuit is coupled to described output signal through buffering, and first homophase (I) component signal of the generation that described first frequency dividing circuit is exported and first quadrature (Q) component signal of generation send at least one image-reject mixer so that described output signal is carried out down-conversion;
And/or described one or more circuit also is used for second frequency dividing circuit is coupled to the first I component signal of the described generation of described first frequency dividing circuit output, virtual frequency dividing circuit is coupled to the first Q component signal of the described generation of described first frequency dividing circuit output, and the second I component signal of the generation that described second frequency dividing circuit is exported and the second Q component signal of generation send at least one image-reject mixer so that described output signal is carried out down-conversion;
Also be used to use at least one quadrature network with described one or more circuit, the I and the Q component of the output signal that generates described image-reject mixer respectively and generated.
Applications Claiming Priority (4)
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| US86881806P | 2006-12-06 | 2006-12-06 | |
| US60/868,818 | 2006-12-06 | ||
| US11/618,716 US7869781B2 (en) | 2006-12-06 | 2006-12-29 | Method and system for mitigating the effects of pulling in multiple phase locked loops in multi-standard systems |
| US11/618,716 | 2006-12-29 |
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| CN101257321A CN101257321A (en) | 2008-09-03 |
| CN101257321B true CN101257321B (en) | 2011-12-14 |
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| CN200710199438.7A Active CN101207399B (en) | 2006-12-06 | 2007-12-03 | Method and system for controlling circuit in an emitter |
| CN200710197190.0A Active CN101257329B (en) | 2006-12-06 | 2007-12-04 | Controlling method and system in emitter |
| CN2007101991016A Active CN101257322B (en) | 2006-12-06 | 2007-12-05 | Method and system for processing signal received by communication medium |
| CN2007101934009A Active CN101257321B (en) | 2006-12-06 | 2007-12-05 | Method and system for processing signal |
| CNA2007101968645A Pending CN101207420A (en) | 2006-12-06 | 2007-12-06 | Method and system for processing signal |
| CN200710196863.0A Expired - Fee Related CN101212441B (en) | 2006-12-06 | 2007-12-06 | Method and system for processing signal in communication system |
| CNA2007101968626A Pending CN101207389A (en) | 2006-12-06 | 2007-12-06 | Method and system for receiving and/or sending signals via a radio communication media |
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| CN200710199438.7A Active CN101207399B (en) | 2006-12-06 | 2007-12-03 | Method and system for controlling circuit in an emitter |
| CN200710197190.0A Active CN101257329B (en) | 2006-12-06 | 2007-12-04 | Controlling method and system in emitter |
| CN2007101991016A Active CN101257322B (en) | 2006-12-06 | 2007-12-05 | Method and system for processing signal received by communication medium |
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| CNA2007101968645A Pending CN101207420A (en) | 2006-12-06 | 2007-12-06 | Method and system for processing signal |
| CN200710196863.0A Expired - Fee Related CN101212441B (en) | 2006-12-06 | 2007-12-06 | Method and system for processing signal in communication system |
| CNA2007101968626A Pending CN101207389A (en) | 2006-12-06 | 2007-12-06 | Method and system for receiving and/or sending signals via a radio communication media |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101207399B (en) | 2014-06-04 |
| CN101257322A (en) | 2008-09-03 |
| CN101257329A (en) | 2008-09-03 |
| CN101212441B (en) | 2015-04-29 |
| CN101207420A (en) | 2008-06-25 |
| CN101207399A (en) | 2008-06-25 |
| CN101257322B (en) | 2012-05-30 |
| CN101257329B (en) | 2013-03-20 |
| CN101212441A (en) | 2008-07-02 |
| CN101257321A (en) | 2008-09-03 |
| CN101207389A (en) | 2008-06-25 |
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