CN105811886A - Improved Gilbert mixer applied to wireless communication transceiver system - Google Patents
Improved Gilbert mixer applied to wireless communication transceiver system Download PDFInfo
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- CN105811886A CN105811886A CN201610247216.7A CN201610247216A CN105811886A CN 105811886 A CN105811886 A CN 105811886A CN 201610247216 A CN201610247216 A CN 201610247216A CN 105811886 A CN105811886 A CN 105811886A
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- Prior art keywords
- nodal point
- gilbert mixer
- effect transistor
- field effect
- wireless communication
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/12—Transference of modulation from one carrier to another, e.g. frequency-changing by means of semiconductor devices having more than two electrodes
- H03D7/125—Transference of modulation from one carrier to another, e.g. frequency-changing by means of semiconductor devices having more than two electrodes with field effect transistors
Abstract
The invention belongs to wireless communication transceiver systems, and specifically relates to an improved Gilbert mixer applied to the wireless communication transceiver system. The Gilbert mixer comprises a transconductance input stage, a local oscillator input stage and an output stage, and is characterized in that a first node and a second node are set between the transconductance input stage and the local oscillator input stage, the first node and the second node are connected with a linearization circuit, and the linearization circuit is a negative feedback circuit keeping common-mode voltage of the first node and the second node stable. The improved Gilbert mixer applied to the wireless communication transceiver system has the beneficial effect that the Gilbert mixer makes a quiescent operating point more stable by means of being additionally provided with the linearization circuit, and thus, the degree of linearity of the mixer is improved.
Description
Technical field
The invention belongs to wireless communication transceiver system, be specifically related to modified model gilbert mixer.
Background technology
In recent years, along with developing rapidly of the communications industry, people are also more and more higher to the performance requirement of transceiver.Owing to frequency mixer is a nonlinear system, can there is gain compression in signal, it is also possible to radiofrequency signal is blocked after frequency mixer, but also can produce unnecessary frequency component, interference useful signal produces distortion, so the linearity is a very important index.But being affected owing to the direct current biasing of frequency mixer can be subject to the change of supply voltage, the change of technique and the change of temperature, the instability of biasing circuit can affect the linearity of frequency mixer.
Although traditional gilbert mixer adopts traditional source electrode/emitter degeneration can improve the linearity, major downside is that higher noise coefficient, make gain decline to a great extent simultaneously, the linearizer adopted in this patent has degenerative effect, stablize quiescent point, realize the higher linearity when not adopting bias current, utilize the metal-oxide-semiconductor being operated in deep linear zone as active load, regulate conversion gain, the problem solving the gain deficiency caused because of negative feedback.
Summary of the invention
This invention address that the problems referred to above, it is provided that a kind of modified model gilbert mixer being applied to wireless communication transceiver system.
Technical scheme is applied to the modified model gilbert mixer of wireless communication transceiver system as follows, including gilbert mixer, gilbert mixer includes transconductance input stage, local oscillator input stage and output stage, primary nodal point and secondary nodal point it is provided with between described transconductance input stage and local oscillator input stage, being connected to linearizer on described primary nodal point and secondary nodal point, described linearizer is that negative-feedback circuit makes the common-mode voltage of primary nodal point and secondary nodal point remain stable for.
The present invention to realize process as follows: as the voltage deviation common-mode voltage V at these two endsCMTime, the anode to operational amplifier that the change of voltage will be inputted by feedback circuit, the output causing operational amplifier produces change, and operational amplifier controls input or extracts the electric current of primary nodal point and secondary nodal point, and the average voltage making two nodes is stable at common-mode voltage VCM。
Accompanying drawing explanation
Fig. 1 is existing gilbert mixer circuit diagram.
Fig. 2 is the gilbert mixer circuit diagram after the present invention improves.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
It is applied to the modified model gilbert mixer of wireless communication transceiver system, including gilbert mixer, gilbert mixer includes transconductance input stage, local oscillator input stage and output stage, it is characterized in that: between described transconductance input stage and local oscillator input stage, be provided with primary nodal point and secondary nodal point, being connected to linearizer on described primary nodal point and secondary nodal point, described linearizer is that negative-feedback circuit makes the common-mode voltage of primary nodal point and secondary nodal point remain stable for.
Further, described linearizer includes operational amplifier and switching tube, switching tube is field effect transistor P1 and field effect transistor P2, the output of the grid concatenation operation amplifier of field effect transistor P1 and field effect transistor P2, the source electrode of field effect transistor P1 and drain electrode connect power end and primary nodal point, the source electrode of field effect transistor P2 and drain electrode connect power end and secondary nodal point, and the homophase input port of operational amplifier connects primary nodal point and secondary nodal point, the anti-phase input mouth common mode input of operational amplifier.
Further, described linearizer also includes feedback resistance R1, feedback resistance R2 and partially installing capacitor, the two ends of described feedback resistance R1 connect the in-phase input end of primary nodal point and operational amplifier, the two ends of described feedback resistance R2 connect the in-phase input end of secondary nodal point and operational amplifier, and described partially installing capacitor is connected to the common port of the homophase input port of feedback resistance R1, feedback resistance R2 and amplifier.
Presently contemplate the change of circuit static operating point.Primary nodal point BBout+ and secondary nodal point BBout-static bias voltage equal, and voltage swing is all common-mode voltage VCM, because the resistance of two feedback resistance R1 and R2 is equal, so the equal threshold voltage of two static bias voltage, namely the voltage of the input in the same direction of operational amplifier is also equal to common-mode voltage VCM.The now input of amplifier is zero, and output is also zero, and switching tube is two PMOS, and PMOS P1 and P2 is in the conduction state, when the static bias voltage of primary nodal point BBout+ and secondary nodal point BBout-increases deviation common-mode voltage V simultaneouslyCMTime, average also increases, and the in-phase input end voltage of operational amplifier increases, and output increases.The output of operational amplifier connects the grid of field effect transistor P1 and P2, the grid voltage of PMOS increases, the electric current flowing through pipe reduces, be equivalent to extract electric current to primary nodal point BBout+ and secondary nodal point BBout-, the electric current of primary nodal point BBout+ and secondary nodal point BBout-reduces, voltage declines simultaneously, returns to original common-mode voltage VCMTime field effect transistor P1 and P2 no longer extract electric current.In like manner, when the static bias voltage of primary nodal point BBout+ and secondary nodal point BBout-reduces simultaneously, average also reduces, and the in-phase input end voltage of operational amplifier reduces, and output reduces.The grid voltage of field effect transistor P1 and P2 reduces, the electric current flowing through pipe increases, and is equivalent to increase to primary nodal point BBout+ and secondary nodal point BBout-injection current, primary nodal point BBout+ and secondary nodal point BBout-electric current, the common-mode voltage of two nodes increases simultaneously, returns to original common-mode voltage VCMTime, field effect transistor P1 and P2 no longer locates injection current to drain terminal BBout+ and the BBout-of primary nodal point BBout+ and secondary nodal point BBout-.Linearizer linearizer act like a feedback loop, the static voltage stability of the primary nodal point BBout+ of Gilbert cell and secondary nodal point BBout-at common-mode voltage VCM, as the voltage deviation common-mode voltage V at these two endsCMTime, the anode to operational amplifier that the change of voltage will be inputted by feedback circuit, causes the output of operational amplifier to produce change, now field effect transistor P1 and P2 conducting, electric current is flowed in the middle of loop by switching tube, until the voltage of biasing is from newly returning to common-mode voltage VCM.The stability of quiescent point is enhanced by adding feedback control loop, thus improve the linearity of frequency mixer, being simultaneously introduced negative feedback and circuit bias voltage of maintenance primary nodal point BBout+ and secondary nodal point BBout-when technique, temperature and supply voltage are unstable can be allowed equal.
It addition, the first-harmonic of signal BBout+ and the BBout-that feedback resistance R1 and R2 is differential output and fundamental harmonic wave provide high impedance, to the impedance that even-order harmonic is low, linearizer is allowed to play the effect reducing even-order harmonic.Because the existence of even-order harmonic can be substantially reduced the linearity of circuit.Additionally, the supply voltage VDD2 of linearizer has only to power for linearizer, we are least in power-consuming in order to allow, and therefore VDD2 is less than VDD.Because circuit has symmetry, so the value of resistance R1 and R2 is equal.Feedback control loop can pass through to adjust the resistance of R1 and R2 and partially installing capacitor CbiasObtain the closed-loop bandwidth wanted.
Outfan adopts two NMOS tube of N1 and N2 to be operated in variable linear resistance area as active load, by voltage VCASBiasing, we can pass through to adjust voltage VCASControl the resistance value of N1 and N2, thus changing the gain of frequency mixer.
The present invention has the beneficial effects that: 1. gilbert mixer makes quiescent point more stable by additional linearizer, thus improve the linearity of frequency mixer.2. eliminate the feedback resistance of the source electrode of transconductance input stage, make the noise coefficient of circuit decline.3. adopt and be operated in the NMOS tube of deep linear zone as active load, make conversion gain adjustable, decrease the negative feedback produced because of the linearizer impact on conversion gain.4. linearizer can pass through to regulate negative feedback resistor R1 and the R2 and partially installing capacitor C of circuitbiasValue obtain the closed loop circuit bandwidth wanted.5. linearizer shows as high impedance for first-harmonic and fundamental harmonic wave, and even-order harmonic is shown as Low ESR, so that linearizer can suppress even-order harmonic.
Claims (3)
1. it is applied to the modified model gilbert mixer of wireless communication transceiver system, including gilbert mixer, gilbert mixer includes transconductance input stage, local oscillator input stage and output stage, it is characterized in that: between described transconductance input stage and local oscillator input stage, be provided with primary nodal point and secondary nodal point, being connected to linearizer on described primary nodal point and secondary nodal point, described linearizer is that negative-feedback circuit makes the common-mode voltage of primary nodal point and secondary nodal point remain stable for.
2. the modified model gilbert mixer being applied to wireless communication transceiver system according to claim 1, it is characterized in that: described linearizer includes operational amplifier and switching tube, switching tube is field effect transistor P1 and field effect transistor P2, the output of the grid concatenation operation amplifier of field effect transistor P1 and field effect transistor P2, the source electrode of field effect transistor P1 and drain electrode connect power end and primary nodal point, the source electrode of field effect transistor P2 and drain electrode connect power end and secondary nodal point, the homophase input port of operational amplifier connects primary nodal point and secondary nodal point, the anti-phase input mouth common mode input of operational amplifier.
3. the modified model gilbert mixer being applied to wireless communication transceiver system according to claim 2, it is characterized in that: described linearizer also includes feedback resistance R1, feedback resistance R2 and partially installing capacitor, the two ends of described feedback resistance R1 connect the in-phase input end of primary nodal point and operational amplifier, the two ends of described feedback resistance R2 connect the in-phase input end of secondary nodal point and operational amplifier, and described partially installing capacitor is connected to the common port of the homophase input port of feedback resistance R1, feedback resistance R2 and amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610247216.7A CN105811886A (en) | 2016-04-20 | 2016-04-20 | Improved Gilbert mixer applied to wireless communication transceiver system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610247216.7A CN105811886A (en) | 2016-04-20 | 2016-04-20 | Improved Gilbert mixer applied to wireless communication transceiver system |
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| CN105811886A true CN105811886A (en) | 2016-07-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105897172A (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Linearity improved mixer |
| CN110858759A (en) * | 2018-08-24 | 2020-03-03 | 瑞昱半导体股份有限公司 | Single sideband mixer and method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6985035B1 (en) * | 1998-11-12 | 2006-01-10 | Broadcom Corporation | System and method for linearizing a CMOS differential pair |
| CN101902202A (en) * | 2009-05-27 | 2010-12-01 | 晨星软件研发(深圳)有限公司 | Frequency mixer with high linearity and low work voltage |
| US8493127B1 (en) * | 2012-03-13 | 2013-07-23 | Fujitsu Semiconductor Limited | System and method for linearization of a mixer |
| CN105897172A (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Linearity improved mixer |
| CN205864373U (en) * | 2016-04-20 | 2017-01-04 | 佛山臻智微芯科技有限公司 | It is applied to the modified model gilbert mixer of wireless communication transceiver system |
-
2016
- 2016-04-20 CN CN201610247216.7A patent/CN105811886A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6985035B1 (en) * | 1998-11-12 | 2006-01-10 | Broadcom Corporation | System and method for linearizing a CMOS differential pair |
| CN101902202A (en) * | 2009-05-27 | 2010-12-01 | 晨星软件研发(深圳)有限公司 | Frequency mixer with high linearity and low work voltage |
| US8493127B1 (en) * | 2012-03-13 | 2013-07-23 | Fujitsu Semiconductor Limited | System and method for linearization of a mixer |
| CN105897172A (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Linearity improved mixer |
| CN205864373U (en) * | 2016-04-20 | 2017-01-04 | 佛山臻智微芯科技有限公司 | It is applied to the modified model gilbert mixer of wireless communication transceiver system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105897172A (en) * | 2016-04-20 | 2016-08-24 | 佛山臻智微芯科技有限公司 | Linearity improved mixer |
| CN110858759A (en) * | 2018-08-24 | 2020-03-03 | 瑞昱半导体股份有限公司 | Single sideband mixer and method thereof |
| CN110858759B (en) * | 2018-08-24 | 2023-03-31 | 瑞昱半导体股份有限公司 | Single side band mixer circuit |
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Application publication date: 20160727 |
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