CN209462364U - The circuit structure of receiver dynamic range is improved based on reverse phase cancellation mechanism - Google Patents
The circuit structure of receiver dynamic range is improved based on reverse phase cancellation mechanism Download PDFInfo
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- CN209462364U CN209462364U CN201920057956.3U CN201920057956U CN209462364U CN 209462364 U CN209462364 U CN 209462364U CN 201920057956 U CN201920057956 U CN 201920057956U CN 209462364 U CN209462364 U CN 209462364U
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Abstract
The utility model relates to a kind of circuit structures that receiver dynamic range is improved based on reverse phase cancellation mechanism, including preselection filter module, the output end of the preselection filter module to be connected with power splitter；Receiving channel module is detected, the input terminal of the detection receiving channel module is connected with the output end of the preselection filter module；Channel module is offset, the input terminal of the counteracting channel module is connected with the output end of the detection receiving channel module；Receiver channel module.Using the circuit structure for improving receiver dynamic range based on reverse phase cancellation mechanism of the utility model, the method offset by radiofrequency signal, in the case of realization strong jamming, the small received validity of signal, high reject signal present in channel can effectively be inhibited, measurement analysis etc. to realize small signal, identical circuit structure substantially increases the linear dynamic range of system.
Description
Technical field
The utility model relates to signal analysis field more particularly to receiver signal analysis technical fields, in particular to one
Kind improves the circuit structure of receiver dynamic range based on reverse phase cancellation mechanism.
Background technique
Receiver is middle widely used device, and effect is to receive signal, carries out the analysis, measurement, information of signal also
Original etc..According to the Technical Architecture of receiver, superhet and zero intermediate frequency reciver etc. can be divided into.Wherein, the most commonly used is
Superhet, its main feature is that working frequency range is wide, high sensitivity.Typical receiver architecture is as shown in Figure 1.
Its working principle is that input signal be down-converted on a fixed intermediate frequency signal, subsequent progress ADC and phase
OFF signal processing, has extracted relevant information.The considerations of this super-heterodyne architecture is because of factors such as working frequency range, the bandwidth of system become
Frequency series has 1~4 grade and differs.With increasing for series, internal amplification, filter circuit are also required to increase accordingly, circuit knot
Structure is extremely complex.The addition of a large amount of analog devices keeps the dynamic range design comparison of system difficult.Under certain applications,
It is some small-signals that system, which needs the useful information of reception and analysis, and there are some around the frequency range of these small-signals
Strong signal, and strong signal is that system is unconcerned.For example, Radar Doppler back wave is deposited in the sideband of high-power transmitting signal
On, there are high-intensitive other operator's base station signals etc. around highly sensitive wireless communication module.
In order to realize that the signal under the above scene receives, existing various receiver technical solutions are mainly penetrated from simulation
Frequency channel is started with, and uses some means and measure, mainly has:
(1) system front end carries out the separation of large-and small-signal by filter.This mode is most direct, but to filter
It is more demanding, especially signal frequency it is closely spaced in the case where, the method is invalid.
(2) it optimizes hardware circuit design, carries out reasonable gain distribution, the circuits such as amplifier, frequency mixer are optimized and are set
Meter, improves the performance indicator of the linearity, but the hardware design difficulty of this mode is big, and degree of optimization is limited.
In conclusion the technical solution of existing receiver, to presence and the high reject signal near small signal frequency, if
The amplitude of this high reject signal has reached mission nonlinear working range, and channel will generate various nonlinearity products, thus shadow
Ring the parsing of small signal.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the above-mentioned prior arts, provide it is a kind of satisfaction automatically track, from
Dynamic counteracting, the circuit structure applied widely that receiver dynamic range is improved based on reverse phase cancellation mechanism.
To achieve the goals above, the circuit that receiver dynamic range is improved based on reverse phase cancellation mechanism of the utility model
Structure is as follows:
The circuit structure that receiver dynamic range is improved based on reverse phase cancellation mechanism of the utility model, main feature
It is that the circuit structure includes:
The output end of preselection filter module, the preselection filter module is connected with power splitter；
Detect receiving channel module, the input terminal of the detection receiving channel module and the preselection filter module
Output end be connected；
Offset channel module, the output of the input terminal of the counteracting channel module and the detection receiving channel module
End is connected；
Receiver channel module, the input terminal of the receiver channel module and the preselection filter module and is supported
The output end of channel module of disappearing is connected.
Preferably, the detection receiving channel module includes:
The input terminal of first frequency mixer, first frequency mixer is connected with the output end of the power splitter；
First bandpass filter, the output end of the input terminal of first bandpass filter and first frequency mixer
It is connected；
First A-D converter, the input terminal of first A-D converter are defeated with first bandpass filter
Outlet is connected；
First digital down converter, the input terminal of first digital down converter and first A-D converter
Output end be connected；
First bandwidth control units, the input terminal of first bandwidth control units and first Digital Down Convert
The output end of device is connected, and the output end of first bandwidth control units is connected with the counteracting channel module.
Preferably, the counteracting channel module includes:
Digital up converter, the output of the input terminal of the digital up converter and the detection receiving channel module
End is connected；
Digital up converter, the output end phase of the input terminal of the digital up converter and the digital up converter
Connection；
Digital-to-analog converter, the input terminal of the digital-to-analog converter are connected with the output end of the digital up converter
It connects；
Low-pass filter, the input terminal of the low-pass filter are connected with the output end of the digital-to-analog converter.
Preferably, the counteracting channel module further includes the second frequency mixer, the input terminal of second frequency mixer with
The output end of the low-pass filter is connected.
Preferably, the receiver channel module includes:
Time delay circuit unit, the input terminal of the time delay circuit unit are connected with the output end of the power splitter；
Summing circuit unit, the output end of the input terminal of the summing circuit unit and the time delay circuit unit and
The output end for offsetting the second frequency mixer of channel module is connected；
Third frequency mixer, the input terminal of the third frequency mixer are connected with the output end of the summing circuit unit
It connects；
Second bandpass filter, the output end of the input terminal of second bandpass filter and the third frequency mixer
It is connected；
Second A-D converter, the input terminal of second A-D converter are defeated with second bandpass filter
Outlet is connected；
Second digital down converter, the input terminal of second digital down converter and second A-D converter
Output end be connected.
Preferably, the detection receiving channel module further includes the first local oscillator unit, the first local oscillator unit
Output end is connected with the input terminal of first frequency mixer.
Preferably, the counteracting channel module further includes the second local oscillator unit, the output of the second local oscillator unit
End is connected with the input terminal of the input terminal of second frequency mixer and third frequency mixer simultaneously.
Preferably, the output end of the first local oscillator unit is also connected with the input terminal of the third frequency mixer.
Using the circuit structure for improving receiver dynamic range based on reverse phase cancellation mechanism of the utility model, by penetrating
The method of frequency signal cancellation, in the case of realizing strong jamming, the small received validity of signal.Have the advantage that (1) passes through counteracting
Mechanism can effectively inhibit high reject signal present in channel, to realize measurement analysis of small signal etc., identical electricity
Line structure substantially increases the linear dynamic range of system, passes through this method, at least improvement Dynamic Range 20dB, warp
It crosses after fine adjustment up to 30~35dB.(2) the method is especially suitable for the closely spaced signal processing of signal frequency, and before this,
It handles extremely difficult for the interference signal in this band or even cannot achieve.(3) interval of offseting signal and bandwidth be all
It is program-controlled and automatically track, it is easy to use.(4) this programme has certain scalability, can increase sense channel quantity,
Realized application existing for a high reject signal.
Detailed description of the invention
Fig. 1 is the typical superhet block diagram of the prior art.
Fig. 2 is the signal of the circuit structure that receiver dynamic range is improved based on reverse phase cancellation mechanism of the utility model
Figure.
Fig. 3 be the utility model based on reverse phase cancellation mechanism improve receiver dynamic range circuit structure monitoring and
The signal processing schematic diagram of receiving channel.
Fig. 4 is the embodiment of the circuit structure that receiver dynamic range is improved based on reverse phase cancellation mechanism of the utility model
The improved broadband cancellation scheme schematic diagram of one scheme.
Fig. 5 is the embodiment of the circuit structure that receiver dynamic range is improved based on reverse phase cancellation mechanism of the utility model
The two improvement project schematic diagram that offseting signal is generated using high-speed DAC.
Appended drawing reference:
The first frequency mixer of Mixer1
The first bandpass filter of BPF1
The first A-D converter of ADC1
The first digital down converter of DDC1
The first bandwidth control units of BWC
DUC digital up converter
DDL digital delaying circuit unit
LPF low-pass filter
The second frequency mixer of Mixer3
DL time delay circuit unit
Mixer2 third frequency mixer
The second bandpass filter of BPF2
The second A-D converter of ADC2
The second digital down converter of DDC2
LO1 the first local oscillator unit
LO2 the second local oscillator unit
Specific embodiment
In order to more clearly describe the technology contents of the utility model, carry out combined with specific embodiments below into one
The description of step.
In the technical solution of the circuit structure for improving receiver dynamic range based on reverse phase cancellation mechanism of the utility model,
Wherein included each functional module and modular unit can correspond to the particular hardware circuit in integrated circuit structure, because
This only relates to the improvement of particular hardware circuit, and hardware components not only only belong to execute the load of control software or computer program
Body, therefore solve corresponding technical problem and obtain corresponding technical effect to be also not directed to any control software or computer
The application of program, that is to say, that the utility model is just in terms of hardware circuit involved in these modules and unit
Improvement can solve technical problem to be solved, and obtain corresponding technical effect, and do not need auxiliary with specific
Control software or computer program corresponding function can be thus achieved.
The circuit structure that receiver dynamic range is improved based on reverse phase cancellation mechanism of the utility model, wherein described
Circuit structure includes:
The output end of preselection filter module, the preselection filter module is connected with power splitter；
Detect receiving channel module, the input terminal of the detection receiving channel module and the preselection filter module
Output end be connected；
Offset channel module, the output of the input terminal of the counteracting channel module and the detection receiving channel module
End is connected；
Receiver channel module, the input terminal of the receiver channel module and the preselection filter module and is supported
The output end of channel module of disappearing is connected.
As preferred embodiments of the present invention, the detection receiving channel module includes:
First frequency mixer Mixer1, the output end of the input terminal of the first frequency mixer Mixer1 and the power splitter
It is connected；
First bandpass filter BPF1, the input terminal of the first bandpass filter BPF1 and first frequency mixer
The output end of Mixer1 is connected；
First A-D converter ADC1, the input terminal of the first A-D converter ADC1 and first band logical are filtered
The output end of wave device BPF1 is connected；
First digital down converter DDC1, the input terminal of the first digital down converter DDC1 and first mould
The output end of A/D converter ADC1 is connected；
First bandwidth control units BWC, the input terminal of the first bandwidth control units BWC and first number
The output end of low-converter DDC1 is connected, the output end of the first bandwidth control units BWC and the counteracting channel
Module is connected.
As preferred embodiments of the present invention, the counteracting channel module includes:
Digital up converter DUC, the input terminal of the digital up converter DUC and the detection receiving channel module
Output end be connected；
Digital up converter DDL, the input terminal of the digital up converter DDL and the digital up converter DUC
Output end be connected；
Digital-to-analog converter, the output end phase of the input terminal of the digital-to-analog converter and the digital up converter DDL
Connection；
The output end phase of the input terminal and the digital-to-analog converter of low-pass filter LPF, the low-pass filter LPF
Connection.
As preferred embodiments of the present invention, the counteracting channel module further includes the second frequency mixer
The input terminal of Mixer3, the second frequency mixer Mixer3 are connected with the output end of the low-pass filter LPF.
As preferred embodiments of the present invention, the receiver channel module includes:
Time delay circuit unit DL, the input terminal of the time delay circuit unit DL are connected with the output end of the power splitter
It connects；
Summing circuit unit, the output end of the input terminal of the summing circuit unit and the time delay circuit unit DL
It is connected with the output end for the second frequency mixer Mixer3 for offsetting channel module；
Third frequency mixer Mixer2, the input terminal of the third frequency mixer Mixer2 and the summing circuit unit
Output end is connected；
Second bandpass filter BPF2, the input terminal of the second bandpass filter BPF2 and the third frequency mixer
The output end of Mixer2 is connected；
Second A-D converter ADC2, the input terminal of the second A-D converter ADC2 and second band logical are filtered
The output end of wave device BPF2 is connected；
Second digital down converter DDC2, the input terminal of the second digital down converter DDC2 and second mould
The output end of A/D converter ADC2 is connected.
As preferred embodiments of the present invention, the detection receiving channel module further includes the first local oscillator unit
The output end of LO1, the first local oscillator unit LO1 are connected with the input terminal of the first frequency mixer Mixer1.
As preferred embodiments of the present invention, the counteracting channel module further includes the second local oscillator unit LO2,
The output end of the second local oscillator unit LO2 input terminal and third frequency mixer with the second frequency mixer Mixer3 simultaneously
The input terminal of Mixer2 is connected.
As preferred embodiments of the present invention, the output end of the first local oscillator unit LO1 also with it is described
The input terminal of third frequency mixer Mixer2 is connected.
In specific embodiment of the present utility model, the system block diagram and connection relationship of the utility model are as shown in Fig. 2, connect
The radio frequency input of receipts machine first passes around preselection filter module, filters out the signal except the machine, subsequently into a power splitter, it
Afterwards, system is divided into 3 channels, is to detect supporting for receiving channel module, receiver channel module and generation offseting signal respectively
Disappear channel module.The output all the way of power splitter enters detection receiving channel module, which mainly extracts in channel
Strong signal, it is similar with the process flow of receiver channel module, it is to be transformed into intermediate-freuqncy signal by frequency mixer Mixer first, warp
Enter A-D converter ADC after crossing bandpass filter BPF, i/q signal is transformed by digital down converter DDC, by first
Bandwidth control units BWC selects the bandwidth and frequency of quasi- offseting signal, and bandwidth can pass through control.
Pre Filter is preselection filter module in attached drawing, and Detect Channel is detection receiving channel module,
Receive Channel is receiver channel module, and Cancel Channel is to offset channel module.
The I/Q output signal of detection receiving channel module enters counteracting channel module, is transformed by Digital Up Convert DUC
Digital intermediate frequency, then pass through digital delaying circuit DDL, the digital delaying circuit can finely regulating signal phase, be sent to count
Mode converter DAC, is transformed into analog signal, and low-pass filtered device generates and original signal size phase after filtering out high frequency clock signal
Deng, the analog intermediate frequency signal of opposite in phase, transformed on radio frequency band by upper frequency mixer Mixer3, it is logical into receiver
Road sums with original reception signal, enters back into frequency mixer.At this point, the signal into frequency mixer will contain only small signal, and it is big
Signal has been offset because of opposite in phase.Reduce the linearity of frequency mixer below and amplifier circuit.In receiver channel
Delay circuit DL be delayed to analog signal, with guarantee offseting signal generate time it is consistent with this channel.System design
In, the sample rate of ADC is improved as far as possible, otherwise computing relay is excessive, can make thrashing.
Receiving channel module and receiver channel module are detected in attached drawing 2, shares a local oscillation signal, and this design can be with
Realize that the interference in IF passband bandwidth is eliminated, as shown in figure 3, it gives the realizations of two-way Digital Down Convert DDC circuit
Method.Its framework is almost the same, is mainly made of multiplier, FIR filter, half-band filter HB, digital oscillator NCO,
There are two differences for the two, and the frequency of two digital oscillators is different, as can be seen that two frequency phase-difference Δ f, this Δ f in figure
It is exactly the difference on the frequency of strong and weak signals, feed back input after which is obtained by systematic survey.In addition sense channel needs a bandwidth
Control circuit, the purpose is to control the bandwidth of offseting signal, by one group of filtering, therefore reconstitutable digital filter is constituted.
The system that attached drawing 2 and attached drawing 3 are constituted, can offset the signal in midband, at this time the frequency of high low signal
Rate interval is closer, is difficult to separate with filter in radio-frequency head.
The embodiments of the present invention one can also be used for the wider occasion of some broadband receivers and signal frequency interval, such as
Shown in attached drawing 4.Compared with attached drawing 2, sense channel has used independent local oscillator unit LO, rather than shares this with receiver channel
Vibration, this system it is more adaptable, can not only offset the signal of proximal end, and the farther signal of frequency can be offset.Only
It is that hardware system can improve, structure can be complicated.At this point, two local oscillator frequency differences are by setting to receiver channel and interference signal
In frequency difference.
Generation for offseting signal, current high-speed DAC have begun maturation and provide commercialization, are directly by DAC
Exportable broadband rf signal.The embodiments of the present invention two give a kind of side that offseting signal is directly generated by DAC
Case, as shown in Fig. 5, process of the program due to reducing up-conversion substantially reduces the complexity for offsetting channel.
Due to the above-mentioned system schema based on radio frequency cancellation technology of the utility model, big signal can effectively reduce to system
Influence, pass through monitoring signal of interest periphery frequency spectrum actual power, in real time generate, opposite in phase equal with the signal power
Signal, offset and give a signal in radio-frequency channel, thus for promoted receiver system actual dynamic range, and have automatically with
Track, automotive resistance are very suitable to the application of small-signal receiver.
Using the circuit structure for improving receiver dynamic range based on reverse phase cancellation mechanism of the utility model, by penetrating
The method of frequency signal cancellation, in the case of realizing strong jamming, the small received validity of signal.Have the advantage that (1) passes through counteracting
Mechanism can effectively inhibit high reject signal present in channel, to realize measurement analysis of small signal etc., identical electricity
Line structure substantially increases the linear dynamic range of system, passes through this method, at least improvement Dynamic Range 20dB, warp
It crosses after fine adjustment up to 30~35dB.(2) the method is especially suitable for the closely spaced signal processing of signal frequency, and before this,
It handles extremely difficult for the interference signal in this band or even cannot achieve.(3) interval of offseting signal and bandwidth be all
It is program-controlled and automatically track, it is easy to use.(4) this programme has certain scalability, can increase sense channel quantity,
Realized application existing for a high reject signal.
In this description, the utility model is described with reference to its specific embodiment.But it is clear that still can be with
The spirit and scope that various modification can be adapted and converts without departing from the utility model.Therefore, the description and the appended drawings should be considered as
It is illustrative and not restrictive.
Claims (8)
1. a kind of circuit structure for improving receiver dynamic range based on reverse phase cancellation mechanism, which is characterized in that the circuit
Structure includes:
The output end of preselection filter module, the preselection filter module is connected with power splitter；
Receiving channel module is detected, the input terminal for detecting receiving channel module is defeated with the preselection filter module
Outlet is connected；
Offset channel module, the output end phase of the input terminal of the counteracting channel module and the detection receiving channel module
Connection；
Receiver channel module, the input terminal of the receiver channel module and the preselection filter module and counteracting are logical
The output end of road module is connected.
2. the circuit structure according to claim 1 for improving receiver dynamic range based on reverse phase cancellation mechanism, feature
It is, the detection receiving channel module includes:
First frequency mixer (Mixer1), the output end of the input terminal of first frequency mixer (Mixer1) and the power splitter
It is connected；
First bandpass filter (BPF1), the input terminal of first bandpass filter (BPF1) and first frequency mixer
(Mixer1) output end is connected；
First A-D converter (ADC1), the input terminal of first A-D converter (ADC1) and first band logical are filtered
The output end of wave device (BPF1) is connected；
First digital down converter (DDC1), the input terminal of first digital down converter (DDC1) and first mould
The output end of A/D converter (ADC1) is connected；
First bandwidth control units (BWC), the input terminal of first bandwidth control units (BWC) and first number
The output end of low-converter (DDC1) is connected, the output end of first bandwidth control units (BWC) and the counteracting
Channel module is connected.
3. the circuit structure according to claim 1 for improving receiver dynamic range based on reverse phase cancellation mechanism, feature
It is, the counteracting channel module includes:
Digital up converter (DUC), the input terminal of the digital up converter (DUC) and the detection receiving channel module
Output end be connected；
Digital up converter (DDL), the input terminal of the digital up converter (DDL) and the digital up converter
(DUC) output end is connected；
Digital-to-analog converter, the input terminal of the digital-to-analog converter are connected with the output end of the digital up converter (DDL)
It connects；
Low-pass filter (LPF), the output end phase of the input terminal and the digital-to-analog converter of the low-pass filter (LPF)
Connection.
4. the circuit structure according to claim 3 for improving receiver dynamic range based on reverse phase cancellation mechanism, feature
Be, the counteracting channel module further includes the second frequency mixer (Mixer3), second frequency mixer (Mixer3) it is defeated
Enter end to be connected with the output end of the low-pass filter (LPF).
5. the circuit structure according to claim 1 for improving receiver dynamic range based on reverse phase cancellation mechanism, feature
It is, the receiver channel module includes:
The input terminal of time delay circuit unit (DL), the time delay circuit unit (DL) is connected with the output end of the power splitter
It connects；
Summing circuit unit, the output end of the input terminal of the summing circuit unit and the time delay circuit unit (DL) and
The output end for offsetting the second frequency mixer (Mixer3) of channel module is connected；
Third frequency mixer (Mixer2), the input terminal of the third frequency mixer (Mixer2) and the summing circuit unit
Output end is connected；
Second bandpass filter (BPF2), the input terminal of second bandpass filter (BPF2) and the third frequency mixer
(Mixer2) output end is connected；
Second A-D converter (ADC2), the input terminal of second A-D converter (ADC2) and second band logical are filtered
The output end of wave device (BPF2) is connected；
Second digital down converter (DDC2), the input terminal of second digital down converter (DDC2) and second mould
The output end of A/D converter (ADC2) is connected.
6. the circuit structure according to claim 2 for improving receiver dynamic range based on reverse phase cancellation mechanism, feature
It is, the detection receiving channel module further includes the first local oscillator unit (LO1), the first local oscillator unit (LO1)
Output end is connected with the input terminal of first frequency mixer (Mixer1).
7. the circuit structure according to claim 4 for improving receiver dynamic range based on reverse phase cancellation mechanism, described
Receiver channel module includes third frequency mixer (Mixer2), which is characterized in that the counteracting channel module further includes second
Local oscillator unit (LO2), the output end of the second local oscillator unit (LO2) simultaneously with second frequency mixer (Mixer3)
Input terminal is connected with the input terminal of third frequency mixer (Mixer2).
8. the circuit structure according to claim 6 for improving receiver dynamic range based on reverse phase cancellation mechanism, described
Receiver channel module includes third frequency mixer (Mixer2), which is characterized in that the output of the first local oscillator unit (LO1)
End is also connected with the input terminal of the third frequency mixer (Mixer2).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109474288A (en) * | 2019-01-14 | 2019-03-15 | 上海创远仪器技术股份有限公司 | The circuit structure of receiver dynamic range is improved based on reverse phase cancellation mechanism |
| CN111313920A (en) * | 2020-02-19 | 2020-06-19 | 上海特金信息科技有限公司 | Zero intermediate frequency receiver, signal processing method and device thereof, electronic device and medium |
-
2019
- 2019-01-14 CN CN201920057956.3U patent/CN209462364U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109474288A (en) * | 2019-01-14 | 2019-03-15 | 上海创远仪器技术股份有限公司 | The circuit structure of receiver dynamic range is improved based on reverse phase cancellation mechanism |
| CN109474288B (en) * | 2019-01-14 | 2024-03-15 | 上海创远仪器技术股份有限公司 | Circuit structure for improving dynamic range of receiver based on reverse phase offset mechanism |
| CN111313920A (en) * | 2020-02-19 | 2020-06-19 | 上海特金信息科技有限公司 | Zero intermediate frequency receiver, signal processing method and device thereof, electronic device and medium |
| CN111313920B (en) * | 2020-02-19 | 2021-12-03 | 特金智能科技(上海)有限公司 | Zero intermediate frequency receiver, signal processing method and device thereof, electronic device and medium |
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Address after: Block C, No. 7, Lane 205, Gaoji Road, Songjiang District, Shanghai, 201601 Patentee after: Chuangyuan Xinke (Shanghai) Technology Co.,Ltd. Address before: 201601 building 6, 351 sizhuan Road, Sijing Town, Songjiang District, Shanghai Patentee before: TRANSCOM INSTRUMENTS Co.,Ltd. |
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