CN203872136U - Gilbert mixer with high gain and high output swing - Google Patents
Gilbert mixer with high gain and high output swing Download PDFInfo
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- CN203872136U CN203872136U CN201420307059.0U CN201420307059U CN203872136U CN 203872136 U CN203872136 U CN 203872136U CN 201420307059 U CN201420307059 U CN 201420307059U CN 203872136 U CN203872136 U CN 203872136U
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- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 4
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Abstract
The utility model relates to a Gilbert mixer with high gain and high output swing. The Gilbert mixer comprises a tail current source, a transconductance input stage, a switch stage and a load stage. The tail current source circuit provides constant current bias for the whole circuit. Radio-frequency input voltage signals RFin+ and RFin- are converted to current signals through the transconductance input stage, and switching current mixing is carried out on the current signals and local oscillation signals LO+ and LO- through the switch stage circuit. After mixing, the current signals are converted through the load stage to intermediate frequency voltage signals IFout+ and IFout-. In comparison with the structure of a traditional Gilbert mixer, the structure of the Gilbert mixer with high gain and high output swing has advantages as follows: by parallel connection of high-impedance shunt circuits at two ends of a load resistor, a part of DC bias current is shunted, DC voltage drop of the load resistor is reduced, voltage swing margin of an output end is raised, and resistance value of the load resistor also can be raised to realize large conversion gain.
Description
Technical field
The utility model relates to a kind of gilbert mixer, relates in particular to the high output voltage swing gilbert mixer of a kind of high-gain circuit.
Background technology
Gilbert mixer is double balanced mixer, can realize good local oscillator arrives intermediate frequency (LO-IF) to intermediate frequency (RF-IF) and local oscillator isolation to radio frequency (LO-RF), radio frequency, therefore in integrated circuit, have a wide range of applications.But the output voltage swing of gilbert mixer is smaller, mainly contain following 2 reasons: 1, for two balance gilbert's structure frequency mixers, generally for good common mode inhibition capacity is provided, conventionally add input mutual conductance tail current source, add degeneracy resistance at the emitter of input radio frequency pipe simultaneously, in order to improve the linearity of mutual conductance, from power supply to ground, stacked number of transistors is just more like this, thereby has compressed output voltage nargin; 2, the linearity performance of radio frequency transconductance stage is often along with the increase of bias current increases, simultaneously in order to improve the conversion gain of frequency mixer, require load resistance value large as far as possible, large load and large DC bias current have caused direct current pressure drop larger in load, have further compressed output voltage nargin.
Utility model content
Provide one can improve output voltage swing for above problem the utility model, improved conversion gain simultaneously, improve the linearity and don't increase the gilbert mixer of power consumption.
Provide a kind of high-gain high output voltage swing gilbert mixer in order to overcome the above problems the utility model, it is characterized in that: comprise tail current source, mutual conductance input stage, switching stage and load stage; Tail current source circuit provides constant current offset to whole circuit, radio frequency input voltage signal RFin+ and RFin-are by mutual conductance input stage, be converted to current signal, and then carrying out switching current mixing by switching stage circuit and local oscillation signal LO+ and LO-, the current signal after mixing is converted to intermediate frequency output voltage signal IFout+ and IFout-by load stage again.
The utility model is compared with traditional gilbert mixer structure, the utility model is by the shunt circuit of the high impedance in parallel at load resistance two ends, a part of DC bias current is shunted away, reduce the direct current pressure drop of load resistance, improve the voltage swing nargin of output, also can improve load resistance resistance simultaneously to realize larger conversion gain.
Described tail current source comprises germanium silicon ambipolar npn triode Q3 and resistance R 3, and the ambipolar npn triode of germanium silicon Q3 is called for short npn triode;
Mutual conductance input stage comprises npn triode Q1 and the Q2 as mutual conductance pipe, and as R1 and the R2 of emitter degeneracy resistance; Switching stage comprises npn triode Q4, Q5, Q6 and the Q7 as switching tube;
Load stage comprises load resistance R4 and R5, and the ambipolar pnp triode of germanium silicon Q8, Q9, Q10, Q11 and resistance R 6, R7, R8, the R9 of composition shunt circuit, and the ambipolar pnp triode of germanium silicon is called for short pnp triode;
One end of resistance R 3 is connected with the emitter of npn triode Q3, other end ground connection, and the base stage of npn triode Q3 is connected with the voltage Vbias that biasing is provided to tail current source, and the collector electrode of Q3 is connected with one end of resistance R 2 with resistance R 1;
The other end of resistance R 1 is connected with the emitter of npn triode Q1, the other end of resistance R 2 is connected with the emitter of npn triode Q2, the base stage of npn triode Q1 is connected with the anode RFin+ of radio-frequency differential input signal, the collector electrode of npn triode Q1 is connected with the emitter of npn triode Q5 with npn triode Q4, the base stage of npn triode Q2 is connected with the negative terminal RFin-of radio-frequency differential input signal, and the collector electrode of npn triode Q2 is connected with the emitter of npn triode Q7 with npn triode Q6;
Npn triode Q4 is connected with the base stage of npn triode Q7 and the anode LO+ of difference local oscillation signal, npn triode Q5 is connected with the base stage of npn triode Q6 and the negative terminal LO-of difference local oscillation signal, npn triode Q4 is connected with the collector electrode of the collector electrode of npn triode Q6 and one end of resistance R 4 and pnp triode Q8, this end is intermediate frequency output plus terminal IFout+, npn triode Q5 is connected with the collector electrode of the collector electrode of npn triode Q7 and one end of resistance R 5 and pnp triode Q9, and this end is intermediate frequency output negative terminal IFout-;
Another termination power of resistance R 4 and resistance R 5, the emitter of pnp triode Q8 is connected with one end of resistance R 6, and the emitter of pnp triode Q9 is connected with one end of resistance R 7, another termination power of resistance R 6 and resistance R 7;
Pnp triode Q8 is connected with the base stage of pnp triode Q9 and is connected with the base stage of pnp triode Q10, the emitter of pnp triode Q10 is connected with one end of resistance R 8, another termination power of resistance R 8, the collector electrode of pnp triode Q10 is connected with the base stage of pnp triode Q11, and be connected with reference current Iref, the grounded collector of pnp triode Q11, the emitter of pnp triode Q11 is connected with one end of resistance R 9, another termination power of resistance R 9.
Raising gain in the utility model and output amplitude technology, isolated electric current is from the bias current of tail current source, and therefore total current is constant, so do not increase power consumption.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Fig. 2 is shunt circuit figure of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model will be further described.
As shown in Figure 1, 2, the utility model provides a kind of high-gain high output voltage swing gilbert mixer, comprises tail current source, mutual conductance input stage, switching stage and load stage; Tail current source circuit provides constant current offset to whole circuit, radio frequency input voltage signal RFin+ and RFin-are by mutual conductance input stage, be converted to current signal, and then carrying out switching current mixing by switching stage circuit and local oscillation signal LO+ and LO-, the current signal after mixing is converted to intermediate frequency output voltage signal IFout+ and IFout-by load stage again.
Described tail current source comprises germanium silicon ambipolar npn triode Q3 and resistance R 3, and the ambipolar npn triode of germanium silicon Q3 is called for short npn triode;
Mutual conductance input stage comprises npn triode Q1 and the Q2 as mutual conductance pipe, and as R1 and the R2 of emitter degeneracy resistance; Switching stage comprises npn triode Q4, Q5, Q6 and the Q7 as switching tube;
Load stage comprises load resistance R4 and R5, and the ambipolar pnp triode of germanium silicon Q8, Q9, Q10, Q11 and resistance R 6, R7, R8, the R9 of composition shunt circuit, and the ambipolar pnp triode of germanium silicon is called for short pnp triode;
One end of resistance R 3 is connected with the emitter of npn triode Q3, other end ground connection, and the base stage of npn triode Q3 is connected with the voltage Vbias that biasing is provided to tail current source, and the collector electrode of Q3 is connected with one end of resistance R 2 with resistance R 1;
The other end of resistance R 1 is connected with the emitter of npn triode Q1, the other end of resistance R 2 is connected with the emitter of npn triode Q2, the base stage of npn triode Q1 is connected with the anode RFin+ of radio-frequency differential input signal, the collector electrode of npn triode Q1 is connected with the emitter of npn triode Q5 with npn triode Q4, the base stage of npn triode Q2 is connected with the negative terminal RFin-of radio-frequency differential input signal, and the collector electrode of npn triode Q2 is connected with the emitter of npn triode Q7 with npn triode Q6;
Npn triode Q4 is connected with the base stage of npn triode Q7 and the anode LO+ of difference local oscillation signal, npn triode Q5 is connected with the base stage of npn triode Q6 and the negative terminal LO-of difference local oscillation signal, npn triode Q4 is connected with the collector electrode of the collector electrode of npn triode Q6 and one end of resistance R 4 and pnp triode Q8, this end is intermediate frequency output plus terminal IFout+, npn triode Q5 is connected with the collector electrode of the collector electrode of npn triode Q7 and one end of resistance R 5 and pnp triode Q9, and this end is intermediate frequency output negative terminal IFout-;
Another termination power of resistance R 4 and resistance R 5, the emitter of pnp triode Q8 is connected with one end of resistance R 6, and the emitter of pnp triode Q9 is connected with one end of resistance R 7, another termination power of resistance R 6 and resistance R 7;
Pnp triode Q8 is connected with the base stage of pnp triode Q9 and is connected with the base stage of pnp triode Q10, the emitter of pnp triode Q10 is connected with one end of resistance R 8, another termination power of resistance R 8, the collector electrode of pnp triode Q10 is connected with the base stage of pnp triode Q11, and be connected with reference current Iref, the grounded collector of pnp triode Q11, the emitter of pnp triode Q11 is connected with one end of resistance R 9, another termination power of resistance R 9.
The foregoing is only preferred embodiment of the present utility model, be not restricted to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present utility model.
Claims (2)
1. the high output voltage swing gilbert mixer of high-gain, is characterized in that: comprise tail current source, mutual conductance input stage,
Switching stage and load stage; Tail current source circuit provides constant current offset to whole circuit, radio frequency input voltage signal RFin+ and RFin-are by mutual conductance input stage, be converted to current signal, and then carrying out switching current mixing by switching stage circuit and local oscillation signal LO+ and LO-, the current signal after mixing is converted to intermediate frequency output voltage signal IFout+ and IFout-by load stage again.
2. the high output voltage swing gilbert mixer of a kind of high-gain according to claim 1, is characterized in that:
Described tail current source comprises germanium silicon ambipolar npn triode Q3 and resistance R 3, and the ambipolar npn triode of germanium silicon Q3 is called for short npn triode;
Mutual conductance input stage comprises npn triode Q1 and the Q2 as mutual conductance pipe, and as R1 and the R2 of emitter degeneracy resistance; Switching stage comprises npn triode Q4, Q5, Q6 and the Q7 as switching tube;
Load stage comprises load resistance R4 and R5, and the ambipolar pnp triode of germanium silicon Q8, Q9, Q10, Q11 and resistance R 6, R7, R8, the R9 of composition shunt circuit, and the ambipolar pnp triode of germanium silicon is called for short pnp triode;
One end of resistance R 3 is connected with the emitter of npn triode Q3, other end ground connection, and the base stage of npn triode Q3 is connected with the voltage Vbias that biasing is provided to tail current source, and the collector electrode of Q3 is connected with one end of resistance R 2 with resistance R 1;
The other end of resistance R 1 is connected with the emitter of npn triode Q1, the other end of resistance R 2 is connected with the emitter of npn triode Q2, the base stage of npn triode Q1 is connected with the anode RFin+ of radio-frequency differential input signal, the collector electrode of npn triode Q1 is connected with the emitter of npn triode Q5 with npn triode Q4, the base stage of npn triode Q2 is connected with the negative terminal RFin-of radio-frequency differential input signal, and the collector electrode of npn triode Q2 is connected with the emitter of npn triode Q7 with npn triode Q6;
Npn triode Q4 is connected with the base stage of npn triode Q7 and the anode LO+ of difference local oscillation signal, npn triode Q5 is connected with the base stage of npn triode Q6 and the negative terminal LO-of difference local oscillation signal, npn triode Q4 is connected with the collector electrode of the collector electrode of npn triode Q6 and one end of resistance R 4 and pnp triode Q8, this end is intermediate frequency output plus terminal IFout+, npn triode Q5 is connected with the collector electrode of the collector electrode of npn triode Q7 and one end of resistance R 5 and pnp triode Q9, and this end is intermediate frequency output negative terminal IFout-;
Another termination power of resistance R 4 and resistance R 5, the emitter of pnp triode Q8 is connected with one end of resistance R 6, and the emitter of pnp triode Q9 is connected with one end of resistance R 7, another termination power of resistance R 6 and resistance R 7;
Pnp triode Q8 is connected with the base stage of pnp triode Q9 and is connected with the base stage of pnp triode Q10, the emitter of pnp triode Q10 is connected with one end of resistance R 8, another termination power of resistance R 8, the collector electrode of pnp triode Q10 is connected with the base stage of pnp triode Q11, and be connected with reference current Iref, the grounded collector of pnp triode Q11, the emitter of pnp triode Q11 is connected with one end of resistance R 9, another termination power of resistance R 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307059.0U CN203872136U (en) | 2014-06-11 | 2014-06-11 | Gilbert mixer with high gain and high output swing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307059.0U CN203872136U (en) | 2014-06-11 | 2014-06-11 | Gilbert mixer with high gain and high output swing |
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| CN203872136U true CN203872136U (en) | 2014-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420307059.0U Expired - Lifetime CN203872136U (en) | 2014-06-11 | 2014-06-11 | Gilbert mixer with high gain and high output swing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734641A (en) * | 2015-03-23 | 2015-06-24 | 中国科学院微电子研究所 | Frequency mixer |
| CN106341087A (en) * | 2016-08-30 | 2017-01-18 | 吴韵秋 | Frequency mixer |
| CN111245371A (en) * | 2020-03-06 | 2020-06-05 | 重庆百瑞互联电子技术有限公司 | Power mixer, radio frequency circuit, device and equipment |
-
2014
- 2014-06-11 CN CN201420307059.0U patent/CN203872136U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734641A (en) * | 2015-03-23 | 2015-06-24 | 中国科学院微电子研究所 | Frequency mixer |
| CN104734641B (en) * | 2015-03-23 | 2018-04-06 | 中国科学院微电子研究所 | Frequency mixer |
| CN106341087A (en) * | 2016-08-30 | 2017-01-18 | 吴韵秋 | Frequency mixer |
| CN106341087B (en) * | 2016-08-30 | 2019-04-12 | 成都通量科技有限公司 | A kind of frequency mixer |
| CN111245371A (en) * | 2020-03-06 | 2020-06-05 | 重庆百瑞互联电子技术有限公司 | Power mixer, radio frequency circuit, device and equipment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141008 |
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| CX01 | Expiry of patent term |