CN100350672C - Micro multilayer type converter for changing balace into non-balance signal - Google Patents
Micro multilayer type converter for changing balace into non-balance signal Download PDFInfo
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- CN100350672C CN100350672C CNB2004100978449A CN200410097844A CN100350672C CN 100350672 C CN100350672 C CN 100350672C CN B2004100978449 A CNB2004100978449 A CN B2004100978449A CN 200410097844 A CN200410097844 A CN 200410097844A CN 100350672 C CN100350672 C CN 100350672C
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Abstract
The present invention provides a micro multilayer type converter for converting balanced signals into non-balanced signals, which comprises a pair of elements with capacitive character, and at least a section of broadside coupling wire, wherein the broadside coupling wire is connected in series with a non-balanced port and two balanced ports through a pair of transmission wires. Each section of the broadside coupling wire is provided with first coupling wires and second coupling wires. An earthing is connected between two second coupling wires positioned in the center and is connected with an earthing surface. The converter of the present invention can be manufactured and completed by five conductor layers through the multilayer structure and the earthing connection. The present invention reduces the size of the converter and also strengthens steady degree of the converter. The converter of the present invention has good impedance match according to difference and phase difference measured between return loss and the size of the signal responding to the frequency.
Description
Technical field
The invention relates to the balance that is used in radio communication and change non-equilibrium signal transducer (balance-to-unbalance transformer, Balun), particularly a kind of miniature multilayer formula (miniaturized multi-layer) balance is changeed the non-equilibrium signal transducer.
Background technology
It is one of passive device common in the wireless communication system that balance is changeed the non-equilibrium signal transducer, its role is to signal (unbalanced signal) with a unbalanced in the radio communication transceiver module, to convert a pair of size to identical, differ the balanced type difference mode signal (balanced differential signal) of 180 degree, certainly vice versa for its circuit characteristic, just can reduce the interference of common-mode noise (commonmode noise) by the transmission of difference mode signal, so at radio frequency (radio frequency, RF) transmitting-receiving, power amplifier (poweramplifier, PA), the very normal trace of seeing balance commentaries on classics non-equilibrium signal transducer in the circuit design of antenna (antenna) and blender (mixer).
Balance is changeed the non-equilibrium signal transducer polytype, generally can be divided into lump type (lumped-type), Wound-rotor type (coil-type) and distributed (distributed-type) three types.It is to utilize lump type electric capacity and inductance that the lump type balance is changeed the non-equilibrium signal transducer, does impedance matching and produces the phase difference of 180 degree and the balance of equal signal size.The characteristics that this balance is changeed the non-equilibrium signal transducer are that size is small, so very light and handy, but shortcoming is less for the operation frequency range, and are not easy to keep the balance of phase difference and signal magnitude between two signals.
The Wound-rotor type balance is changeed the non-equilibrium signal transducer, and (ultra highfrequency, UHF) frequency band is the most extensive is used at lower band and ultraviolet high frequency.But major defect is to have excessive loss when being applied in above the UHF frequency band, and the downsizing degree has reached the limit.
Distributed balance commentaries on classics non-equilibrium signal transducer also is divided into 180 and spends-blend together type (hybrid) and horse formula type (Marchand).180 degree-mix are molded over microwave band and usually are used, and good frequency response is also arranged.Yet when being applied in radio frequency, frequency, is constituted because it saves quarter-wave transmission line by number between the number GHz between 200MHz, so size is often too big, even utilize the mode of tortuous (meander) also to be difficult to dwindle in a large number its area.In another technology, utilize a power divider to add a pair of different length transmission line to produce the framework of 180 degree phase differences, dwindle its area.Yet, still have oversize problem.
United States Patent (USP) 6,661, the 306 lump type balances that disclose a kind of exquisiteness are changeed the non-equilibrium signal transducer.This transducer has the high pass (highpass) and the low pass (lowpass) of antithesis and arranges (layout).As shown in Figure 1, transducer 100 is to form with the lump type elements combination that crossover is arranged.According to frequency range (band), this transducer 100 is adjusted the size of electric capacity, inductance value, utilize metal transmission line (metaltransmission line) and metal polar plate (metal electrode) on the substrate again, produce the flat board (plate) and spiral (spiral) structure of suitable appearance value and sense value.
The advantage of this kind design is in conjunction with many passive devices, the circuit framework of one-tenth π shape very capable of being combined.Very and with transducer and filter circuit combine, constitute and to have end unbalanced signal output and the other end is the filter of equalize instructing signal output.Yet, its shortcoming is formed for needing a plurality of passive devices, if one of them sensitive passive device then will cause the significantly unusual fluctuation of entire circuit original functional property, and need bigger design space put this circuit design because of after manufacture craft error or properties of materials change slightly.
United States Patent (USP) 6,483,415 disclose a kind of multiple field inductance capacitance resonance (LC resonance) balance changes the non-equilibrium signal transducer.Shown in Fig. 2 A, transducer 200 is to utilize a capacitor 201 and many coupling line 202a-202d to form the inductance capacitance resonant structure, and only is monolateral adjustable (adjustable) transmission line and electric capacity.
Change the non-equilibrium signal transducer with reference to the balance shown in the figure 2B again.This transducer 210 is to utilize at least two capacitor 211-212 and many coupling line 213-214 to form a kind of (equivalent) inductance capacitance resonant structure of equivalence.To be coupled to equalize instructing signal from the unbalanced signal of input port input, export from the balanced type output again.The length of its coupling inductance is relevant with the transmission band design with the area of electric capacity size.Advantage is with three-dimensional stacked structure integration capacitance inductance, can significantly reduce circuit layout area.Shortcoming is that this design architecture is obtained the effect that is equivalent to coupling line center quarter-wave ground connection with half-wavelength, very and need to use metal level more than 6～8 layers.So, but be only applicable to the substrate manufacture technology that multilayer is made, and its manufacture craft contraposition precisely easily influences element making result.
United States Patent (USP) 5,497,137 disclose a kind of five laminar balances changes the non-equilibrium signal transducer.Shown in Fig. 2 C, transducer 220 comprises article one streakline (strip line) 222, one second streakline 226 and one the 3rd streak line 228.Article one, streakline 222 is made up of a 224a of first and one the 2nd 224b part, and both are coupled with second streakline 226 and the 3rd streak line 228 respectively.The shortcoming of this transducer 220 is the same with above-mentioned transducer, obtains the effect that is equivalent to coupling line center quarter-wave ground connection with half-wavelength.
Summary of the invention
The present invention changes the shortcoming of non-equilibrium signal transducer for overcoming above-mentioned conventional balanced.Its main purpose provides a kind of micro multilayer type converter for changing balace into non-balance signal, this transducer has an equivalent circuit, this equivalent circuit has a ground connection to link (ground connection) and a pair ofly has a capacitive element, and this is positioned at the two ends of the coupling line that is connected to balance input/output port (balance I/O port) to having capacitive element.This equivalent circuit comprises first group of at least one joint coupling line, second group of at least one joint coupling line, first and second transmission lines, a pair ofly has capacitive element and a ground connection links.By the structure of multiple field, greatly reduce the size of transducer.Even this transducer can the little number of plies be realized.So this transducer manufacture craft is simple, cost reduces (reduced cost) and can improve productivity ratio (improvedyield rate).
According to the present invention, with respect to central point (center), this all has a symmetrical structure (symmetric structure) to having capacitive element and coupling line.In preferred embodiment of the present invention, the coupling line of these at least one joints is connected together via first and second transmission lines, wherein, be connected to non-equilibrium input/output port and connect together via first transmission line, be connected to the balance input/output port and then connect together via second transmission line with the coupling line on limit with the coupling line on limit.Ground connection links and to be defined between the first group of coupling line and the second group of coupling line, and be connected to the same limit of balance input/output port.Ground connection binding is to be connected to ground (ground).Each transmission line has two ends.One end of first transmission line is connected to ground, and the other end is connected to non-equilibrium input/output port.The two ends of second transmission line are connected to two balance input/output ports respectively.
In practical application, ground connection links available perforation (via hole) or forms with layer metal.Should can be capacitor or vertical coupled electrode (vertical coupling electrode) or level (horizontal) coupling line to having capacitive element.
For reaching above-mentioned purpose, the invention provides a kind of micro multilayer type converter for changing balace into non-balance signal, include: a non-equilibrium port; First and second balance ports; First and second have capacitive element, each has capacitive element and has first and second ends, this first first end with capacitive element is connected to this non-equilibrium port, this first second end ground connection with capacitive element, these second two ends with capacitive element are connected to this first and second balance ports respectively; First and second transmission lines, each transmission line has first and second ends, first end of this first transmission line is connected to this non-equilibrium port, and second end of this first transmission line is connected to ground, and the two ends of this second transmission line are connected to this first and second balance ports respectively; Wide coupling line of more piece, each pitch width face coupling line has first and second coupling lines, first coupling line of each pitch width face coupling line is cascaded via this first transmission line, and second coupling line of each pitch width face coupling line is cascaded via this second transmission line, and; One ground connection links, and has first and second ends, and this first end is connected to second transmission line between two the second central coupling lines, and this second end is connected to ground.
Wherein, this first and second to have capacitive element be capacitor; First and second to have capacitive element be vertical coupled electrode for this; First and second to have capacitive element be horizontal coupling line for this; This transducer is to be formed by the symmetrical multilayer architecture with respect to a central point; The binding of this ground connection is linked to ground via a sheet metal or perforation.
Wherein, this multilayer architecture has the conductor layer of at least five layers of vertical stacking, and include: one first conductor layer, have a main surface, this main surface is formed by this first coupling line of this non-equilibrium port, this first and second balance ports, wide coupling line of described more piece and this first and second transmission line; One second conductor layer has a main surface, and this main surface is formed by second coupling line of wide coupling line of described more piece, this ground connection binding and two perforation at least; One the 3rd conductor layer has a main surface, and this main surface is formed by this first electrode cap and at least one perforation with capacitive element; One the 4th conductor layer has a main surface, and this main surface is formed by this second one first electrode cap and at least one perforation with capacitive element; And one the 5th conductor layer, having a main surface, this main surface is formed by this second one second electrode cap and at least one perforation with capacitive element.
Wherein, the perforation on this second conductor layer is to be used for this first electrode cap with capacitive element is connected to described first coupling line and described non-equilibrium port, and connects this ground connection and be linked to this ground; Perforation on the 3rd conductor layer is to be used for connecting this second to have first electrode cap of capacitive element and second coupling line to this first balance ports; Perforation on the 4th conductor layer is to be used for connecting second to have second electrode cap and second coupling line to the second balance ports of capacitive element.
Adopt the present invention, not only greatly reduce the size of converter apparatus, also strengthened the stability of this converter apparatus.So can be adjusted accurately and higher qualification rate.In addition, this converter apparatus can be used in multiple substrate, comprises medium (dielectric) substrate, pottery (ceramics) substrate, how rice material (nami-material) substrate and integrated circuit (IC) substrate etc.This converter apparatus also can be applicable to make IC, micro electronmechanical (Micro-Electro-Mechanical-Systems, MEMS), passive device or rice technology (nami-technologies) lining how.This converter apparatus also can be applicable in the field of radio communication (wirelesscommunication).Now in conjunction with detailed description and the claim of following accompanying drawing, embodiment, will on address other purpose of the present invention and advantage and be specified in after.
Description of drawings
Fig. 1 is that a traditional lump type balance is changeed the non-equilibrium signal transducer.
Fig. 2 A is that a traditional multiple field inductance capacitance resonance balance is changeed the non-equilibrium signal transducer.
Fig. 2 B is that another traditional multiple field inductance capacitance resonance balance is changeed the non-equilibrium signal transducer.
Fig. 2 C is that five traditional laminar balances are changeed the non-equilibrium signal transducer.
Fig. 3 A is according to the present invention, the equivalent circuit diagram of a preferred embodiment of micro multilayer type converter for changing balace into non-balance signal.
Fig. 3 B is for including wide coupling line of more piece, the circuit diagram after the extension again from Fig. 3 A.Fig. 4 is that the balance with equivalent circuit diagram of Fig. 3 A is changeed a schematic diagram of the multi-layered arrangement structure of non-equilibrium signal transducer.
Fig. 5 A is that balance of the present invention is changeed the response diagram of non-equilibrium signal transducer emulation amplitude to frequency.
Fig. 5 B illustrates that balance of the present invention changes the difference of signal magnitude of non-equilibrium signal transducer and the phase difference simulation result to frequency response.
Wherein, description of reference numerals is as follows:
100 transducers
200 transducers, 201 capacitors
The 202a-202d coupling line
210 transducer capacitor 211-212
The 213-214 coupling line
220 transducers, 222 article one streaklines
226 second streaklines 228 the 3rd streak line
The 224b of 224a first second portion
300 equivalent electric circuit 301a, 301b have capacitive element
302,303 wide coupling line 304 ground connection link
306a, 306b balance input/output port 312, first transmission line
313 second transmission lines, 333,322 ground
305 non-equilibrium input/ output port 302a, 303a first coupling line
302b, 303b second coupling line 308 tie points
The middle segmentum intercalaris on the middle segmentum intercalaris 31j the right on the 31i left side
311 leftmost joint 310 rightmost joints
310a, the 311a first coupling line 310b, 311b second coupling line
401～405 first～the 5th conductor layer 407a～407d perforation
414～416 electrode caps
Embodiment
Fig. 3 A is according to the present invention, the equivalent circuit diagram of a preferred embodiment of micro multilayer type converter for changing balace into non-balance signal.This equivalent circuit 300 comprises a pair of have capacitive element 301a and 301b, a pitch width face coupling line 302, another pitch width face coupling line 303, a pair of transmission line 312 and 313 and one ground connection binding 304, this is to having capacitive element 301a and 301b respectively and be connected to balance and the same limit of non-equilibrium input/output port, and ground connection link 304 be connected to two balance input/output terminal 306a and the same limit of 306b.
As shown in Figure 3A, each has capacitive element and has two ends.End with capacitive element 301a is connected to ground (ground) 333, and the other end is connected to non-equilibrium input/output port 305.Two ends with capacitive element 301b are connected to two balance input/ output terminal 306a and 306b respectively.This pitch width face coupling line 302 also comprises one first coupling line 302a and one second coupling line 302b.This pitch width face coupling line 303 more comprises one first coupling line 303a and one second coupling line 303b.The first coupling line 302a of wide coupling line 302 connects via first transmission line 312 with the first coupling line 303a of wide coupling line 303.Similarly, the second coupling line 302b of wide coupling line 302 connects via second transmission line 313 with the second coupling line 303b of wide coupling line 303.Each transmission line has two ends.One end of first transmission line 312 is connected to ground 333, and the other end is connected to non-equilibrium input/output terminal 305.The two ends of second transmission line 313 are connected to two balance input/ output terminal 306a and 306b respectively.Ground connection link 304 be connected to the same limit of balance input/output port.One end of ground connection binding 304 is connected to the tie point (connection point) 308 between two second coupling line 302b and the 303b, and the other end is connected to ground 322.
In practical application, ground connection links available perforation or forms with layer metal.Having capacitive element can be capacitor or vertical coupled electrode or horizontal coupling line.Wide coupling line in this preferred embodiment has a symmetrical structure with respect to central point.Circuit in this preferred embodiment can comprise wide coupling line of more piece again, extends to both sides abreast with this central point, shown in Fig. 3 B.
As can be seen from Figure 3B, the right and left of central point extends wide coupling line of more piece, is connected to wide coupling line 302 and 303 respectively.Every pitch width face coupling line also comprises one first coupling line and one second coupling line.Each first coupling line of the middle segmentum intercalaris 31i top on the left side connects with series system.Each second coupling line of the middle segmentum intercalaris 31i below on the left side also is to connect with series system.The middle segmentum intercalaris 31j on the right is series connection in a similar manner also.The first coupling line 311a of leftmost joint 311 is connected to non-equilibrium input/output port 305 via first transmission line 312, and its second coupling line 311b is connected to balance input/output port 306a via second transmission line 313.The first coupling line 310a of rightmost joint 310 is connected to ground 333 via first transmission line 312, and its second coupling line 310b is connected to balance input/output port 306b via second transmission line 313.
As previously mentioned, by the structure of multiple field, can greatly reduce the size of transducer.Even this transducer can the little number of plies be realized.This can illustrate by Fig. 4.Fig. 4 illustrates a multi-layered arrangement structure (device structure) of the balance commentaries on classics non-equilibrium signal transducer of the equivalent electric circuit with Fig. 3 A.
Balance among Fig. 4 is changeed the non-equilibrium signal transducer and is comprised five layers of conductor layer 401-405, and vertical stacking forms.On the main surface of first conductor layer 401, formed non-equilibrium input/output port 305,333, two balance input/ output port 306a and 306b, two first coupling line 302a and 303a and two transmission lines 312 and 313 (not being shown on the figure).It is to be manufactured on second conductor layer 402 that two second coupling line 302b and 303b and ground connection link 304.The 3rd conductor layer 403 has been implemented metal-insulator-metal type metal-insulator-metal, the electrode cap 414 with capacitive element 301a MIM).Be connected to ground 333 because have the end of capacitive element 301a, therefore as long as a conductor layer promptly can implement to have the electrode cap of capacitive element completely.Relative, the 4th and the 5th conductor layer 404 and 405 has been implemented the electrode cap with capacitive element 301b 415 and 416 of metal-insulator-metal type.
In this multi-layered arrangement structure, a plurality of perforation that conductor layer is drilled are formed on the binding between the electrical components on the conductor layer to provide.For example, perforation 407a on the 3rd conductor layer 403 provides from the 4th conductor layer 404, pass the binding between second conductor layer, 402 to first conductor layers 401, have electrically connect between capacitive element 301b, the second coupling line 302b and the balance input/output port 306a with formation.Similarly, perforation 407b on the 4th conductor layer 404 provides from the 5th conductor layer 405, pass the binding between second conductor layer, 402 to first conductor layers 401, with formation have capacitive element 301b, the second coupling line 302b and balance input/output port 306b between electrically connect.Perforation 407c on second conductor layer 402 provides from the binding between the 3rd conductor layer 403 to first conductor layers 401, has electrically connect between capacitive element 301a, the first coupling line 302a and the non-equilibrium input/output port 305 with formation.All ground that perforation 407d on second conductor layer 402 provides in different conductor layers link.
According to the present invention, can use different capacitances to reach this balance and change the realization of goal achievement of non-equilibrium signal transducer in operation frequency scope (operating frequency range).Fig. 5 A is that balance of the present invention is changeed response (the amplitude to frequencyresponse) figure of non-equilibrium signal transducer emulation amplitude to frequency.Transverse axis is the operation frequency of transducer for this reason, and unit is GHz.Longitudinal axis explanation is at the return loss of single end points (at single end), and the amplitude of differential mode (differential mode) and common mode (commonmode), and unit is dB.Be meant reflected umpedance (reflected impedance) from the input signal of non-equilibrium input port 305 at the return loss of single end points, its value should be less than-10dB in frequency range (2.34-2.54GHz) lining of design.The amplitude of differential mode is the transmission of power (energy) from the difference mode signal of balance input port input to non-equilibrium port, and its value should be at least in the operation frequency scope-2dB.The amplitude of common mode is the transmission of power from the common-mode signal of balance input port input to non-equilibrium port, and its value should be less than-10dB in the operation frequency scope.
As can be seen from Figure 5A, the value of return loss is less than-10dB.The transmission of power of difference mode signal quite is higher than-2dB.The transmission of power of common-mode signal quite is lower than-10dB.This points out the most energy of balance input port receiving inputted signal, and this energy is also by uniform distribution.So balance of the present invention is changeed the non-equilibrium signal transducer good impedance matching.
Fig. 5 B illustrates that balance of the present invention changes the difference of signal magnitude of non-equilibrium signal transducer and the phase difference simulation result to frequency response.Transverse axis is the operation frequency of transducer for this reason, and unit is GHz.The longitudinal axis is respectively signal magnitude poor (unit is dB) and phase difference (unit is degree).The signal magnitude difference is the signal magnitude difference that transfers to two I/O ports of balance I/O port from non-equilibrium input port, must be less than 2dB.Phase difference value is the phase difference value that transfers to two I/O ports of two balance I/O ports from non-equilibrium input port, must be maintained at about 180 ° ± 10 °.As can be seen from Figure 5B, balance of the present invention is changeed the signal magnitude difference of non-equilibrium signal transducer between 0.25dB and 0.75dB, and phase difference value is between 178 ° and 182 °.
Change the non-equilibrium signal transducer compared to traditional vertical coupled balance, 6-8 layer conductor layer made this transducer at least usually.And micro multilayer type converter for changing balace into non-balance signal of the present invention only needs 5 layers of conductor layer to make, and this is because add ground connection connection in the coupling line that is connected to ground.This not only greatly reduces the size of converter apparatus, has also strengthened the stability of this converter apparatus.So can be adjusted accurately and higher qualification rate.In addition, this converter apparatus can be used in multiple substrate, comprises medium (dielectric) substrate, pottery (ceramics) substrate, how rice material (nami-material) substrate and integrated circuit (IC) substrate etc.This converter apparatus also can be applicable to make IC, micro electronmechanical (Micro-Electro-Mechanical-Systems, MEMS), passive device or rice technology (nami-technologies) lining how.This converter apparatus also can be applicable in the field of radio communication (wirelesscommunication).
Yet the above only is preferred embodiment of the present invention, when not limiting scope of the invention process with this.Promptly the equalization of doing according to claim of the present invention generally changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Claims (10)
1. micro multilayer type converter for changing balace into non-balance signal includes:
One non-equilibrium port;
First and second balance ports;
First and second have capacitive element, each has capacitive element and has first and second ends, this first first end with capacitive element is connected to this non-equilibrium port, this first second end ground connection with capacitive element, these second two ends with capacitive element are connected to this first and second balance ports respectively;
First and second transmission lines, each transmission line has first and second ends, and first end of this first transmission line is connected to this non-equilibrium port, the second end ground connection of this first transmission line, the two ends of this second transmission line are connected to this first and second balance ports respectively;
Wide coupling line of more piece, each pitch width face coupling line has first and second coupling lines, first coupling line of each pitch width face coupling line is cascaded via this first transmission line, and second coupling line of each pitch width face coupling line is cascaded via this second transmission line, and;
One ground connection links, and has first and second ends, and this first end is connected to second transmission line between two the second central coupling lines, and this second end ground connection.
2. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 1, wherein this first and second to have capacitive element be capacitor.
3. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 1, wherein this first and second to have capacitive element be vertical coupled electrode.
4. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 1, wherein this first and second to have capacitive element be horizontal coupling line.
5. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 1, wherein this transducer is to be formed by the symmetrical multilayer architecture with respect to a central point.
6. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 1, wherein this ground connection links via a sheet metal or perforation ground connection.
7. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 5, wherein this multilayer architecture has the conductor layer of at least five layers of vertical stacking, and includes:
One first conductor layer has a main surface, and this main surface is formed by this first coupling line of this non-equilibrium port, this first and second balance ports, wide coupling line of described more piece and this first and second transmission line;
One second conductor layer has a main surface, and this main surface is formed by second coupling line of wide coupling line of described more piece, this ground connection binding and two perforation at least;
One the 3rd conductor layer has a main surface, and this main surface is formed by this first electrode cap and at least one perforation with capacitive element;
One the 4th conductor layer has a main surface, and this main surface is formed by this second one first electrode cap and at least one perforation with capacitive element; And
One the 5th conductor layer has a main surface, and this main surface is formed by this second one second electrode cap with capacitive element.
8. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 7, wherein the perforation on this second conductor layer is to be used for this first electrode cap with capacitive element is connected to described first coupling line and described non-equilibrium port, and connects this ground connection and be linked to this ground.
9. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 7, wherein the perforation on the 3rd conductor layer is to be used for connecting this second to have first electrode cap of capacitive element and second coupling line to this first balance ports.
10. micro multilayer type converter for changing balace into non-balance signal as claimed in claim 7, wherein the perforation on the 4th conductor layer is to be used for connecting second to have second electrode cap and second coupling line to the second balance ports of capacitive element.
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| CNB2004100978449A CN100350672C (en) | 2004-12-01 | 2004-12-01 | Micro multilayer type converter for changing balace into non-balance signal |
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| CNB2004100978449A CN100350672C (en) | 2004-12-01 | 2004-12-01 | Micro multilayer type converter for changing balace into non-balance signal |
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| CN100350672C true CN100350672C (en) | 2007-11-21 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08204488A (en) * | 1995-01-31 | 1996-08-09 | Nippon Telegr & Teleph Corp <Ntt> | Balance-to-unbalance transformer |
| US5886589A (en) * | 1997-05-30 | 1999-03-23 | Analog Devices, Incorporated | Balanced to unbalanced transmission line transformers |
| US6018277A (en) * | 1997-03-20 | 2000-01-25 | Nokia Mobile Phones Limited | Series of strip lines for phasing and balancing a signal |
| CN1377100A (en) * | 2001-03-22 | 2002-10-30 | 财团法人工业技术研究院 | Multi-layer inductor-capacitor resonance type converter from balance to unbalance |
-
2004
- 2004-12-01 CN CNB2004100978449A patent/CN100350672C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08204488A (en) * | 1995-01-31 | 1996-08-09 | Nippon Telegr & Teleph Corp <Ntt> | Balance-to-unbalance transformer |
| US6018277A (en) * | 1997-03-20 | 2000-01-25 | Nokia Mobile Phones Limited | Series of strip lines for phasing and balancing a signal |
| US5886589A (en) * | 1997-05-30 | 1999-03-23 | Analog Devices, Incorporated | Balanced to unbalanced transmission line transformers |
| CN1377100A (en) * | 2001-03-22 | 2002-10-30 | 财团法人工业技术研究院 | Multi-layer inductor-capacitor resonance type converter from balance to unbalance |
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| CN1783579A (en) | 2006-06-07 |
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