CN111293983A - High-linearity active mixer with common-mode feedback - Google Patents
High-linearity active mixer with common-mode feedback Download PDFInfo
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- CN111293983A CN111293983A CN202010047406.0A CN202010047406A CN111293983A CN 111293983 A CN111293983 A CN 111293983A CN 202010047406 A CN202010047406 A CN 202010047406A CN 111293983 A CN111293983 A CN 111293983A
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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
- H03D7/14—Balanced arrangements
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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
- H03D7/16—Multiple-frequency-changing
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Abstract
The invention discloses a high-linearity active mixer with common-mode feedback, which comprises a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit, a first current source, a second current source, a transimpedance amplifier and a common-mode feedback unit, wherein a radio frequency voltage signal is input into the input end of the voltage-current conversion unit, and the output end of the voltage-current conversion unit is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is respectively connected with the drain end of the first current source and the drain end of the second current source, and is simultaneously connected with the input end of the transimpedance amplifier and the input end of the common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit; and the output end of the trans-impedance amplifier outputs a voltage output signal. The output common-mode voltage is not influenced by the process angle and the temperature, the swing amplitude of the output voltage is not limited, and the linearity is better.
Description
Technical Field
The invention relates to the field of radio frequency integrated circuit design, in particular to a circuit structure for improving the linearity of an active mixer.
Background
The active mixer is commonly used in a communication transceiving system, and the linearity of the active mixer directly determines the anti-interference capability of a front end of a receiver. The conventional active mixer adopts a gilbert multiplier structure, as shown in fig. 1, transistors M1 and M2 input a voltage signal VRFConverting into current to act as transconductance, using transistors M3, M4, M5 and M6 as frequency conversion transistors, and obtaining gate input signal VLOConverting the radio frequency current signal into an intermediate frequency current signal, wherein the intermediate frequency current signal flows through resistors R1 and R2 to generate an output voltage signal VIF. Due to the laminationThe multilayer transistor, transistors M1 and M3, occupies a certain voltage margin, the output swing is limited, and the linearity is seriously affected. In addition, the output common mode level of a conventional active mixer varies with process corner and temperature, further deteriorating the linearity of the active mixer.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problem of poor linearity of an active mixer in the prior art, the invention provides a high-linearity active mixer with common-mode feedback.
The technical scheme is as follows: a high-linearity active frequency mixer with common-mode feedback comprises a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit, a first current source, a second current source, a transimpedance amplifier and a common-mode feedback unit, wherein a radio frequency voltage signal is input into the input end of the voltage-current conversion unit, and the output end of the voltage-current conversion unit is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is connected with the drain end of the first current source and the drain end of the second current source respectively, the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the transimpedance amplifier, and the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit; and the output end of the trans-impedance amplifier outputs a voltage output signal.
Further, the common mode feedback unit includes a voltage amplifier, a seventh transistor M7, and an eighth transistor M8, a drain of the first current source and a drain of the second current source are connected to two positive input terminals of the voltage amplifier, a negative input terminal of the voltage amplifier inputs a common mode reference level, an output terminal of the voltage amplifier is connected to input terminals of the seventh transistor M7 and the eighth transistor M8, output terminals of the seventh transistor M7 and the eighth transistor M8 are connected to an output terminal of the voltage-current converting unit, and a common terminal of the seventh transistor M7 and the eighth transistor M8 is connected to a power supply.
Furthermore, the seventh transistor M7 and the eighth transistor M8 are PMOS transistors, the input terminals of the seventh transistor M7 and the eighth transistor M8 are gates, the output terminals are drains, and the common terminal is a source.
Furthermore, the seventh transistor M7 and the eighth transistor M8 are PNP triodes, the input terminals of the seventh transistor M7 and the eighth transistor M8 are bases, the output terminals are collectors, and the common terminal is an emitter.
Further, the voltage-current converting unit includes a first transistor M1 and a second transistor M2, a radio frequency voltage signal is input from input terminals of the first transistor M1 and the second transistor M2, output terminals of the first transistor M1 and the second transistor M2 are output terminals of the voltage-current converting unit, and a common terminal of the first transistor M1 and the second transistor M2 is grounded.
Furthermore, the first transistor M1 and the second transistor M2 are NMOS transistors, the input terminals of the first transistor M1 and the second transistor M2 are gates, the output terminals are drains, and the common terminal is a source.
Further, the first transistor M1 and the second transistor M2 are NPN triodes, the input terminals of the first transistor M1 and the second transistor M2 are bases, the output terminals are collectors, and the common terminal is an emitter.
Further, the radio frequency intermediate frequency conversion unit comprises a third transistor M3, a fourth transistor M4, a fifth transistor M5 and a sixth transistor M6, wherein the sources of the third transistor M3 and the fourth transistor M4, the sources of the fifth transistor M5 and the sixth transistor M6 are differential input terminals of the radio frequency intermediate frequency conversion unit; the drains of the third transistor M3, the fifth transistor M5, the fourth transistor M4 and the sixth transistor M6 are differential output ends of the rf if conversion unit; gate voltages are input to gates of the third transistor M3, the sixth transistor M6, the fourth transistor M4, and the fifth transistor M5.
Further, the third transistor M3, the fourth transistor M4, the fifth transistor M5, and the sixth transistor M6 are NMOS transistors or NPN triodes.
Has the advantages that: compared with the prior art, the high-linearity active frequency mixer with the common-mode feedback provided by the invention has the advantages that the output common-mode voltage is not influenced by the process angle and the temperature to change, the output voltage swing of the active frequency mixer is not generated at the drain ends of the two current sources, but the drain ends of the two current sources flow into the transimpedance amplifier in the form of signal current, and the voltage signal output is generated at the output end of the transimpedance amplifier so as to generate the voltage swing, so that the defect that the output swing of the traditional active frequency mixer is limited is overcome. The high-linearity active mixer has strong practicability in a radio frequency circuit, is simple in structure, and is not limited in output swing amplitude, so that the linearity of the active mixer is improved, and the high-linearity active mixer can be widely applied to radio frequency receiving and transmitting chips.
Drawings
FIG. 1 is a schematic diagram of a conventional active mixer using a Gilbert multiplier;
fig. 2 is a schematic diagram of a high linearity active mixer with common mode feedback of the present invention.
Detailed Description
The invention is further explained below with reference to the figures and the specific embodiments.
As shown in fig. 2, a high linearity active mixer with common mode feedback includes a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit, a first current source I1, a second current source I2, a transimpedance amplifier TIA, and a common mode feedback unit, wherein a radio frequency voltage signal V is input to an input end of the voltage-current conversion unitRFThe output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is respectively connected with the drain end of a first current source I1 and the drain end of a second current source I2, and is simultaneously connected with the input end of a transimpedance amplifier TIA and the input end of a common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit; the output end of the TIA outputs a voltage output signal VIF。
The common mode feedback unit comprises a voltage amplifier AMP, a seventh transistor M7 and an eighth transistor M8, wherein a drain terminal of a first current source I1 and a drain terminal of a second current source I2 are connected with two positive input terminals of the voltage amplifier AMP, a negative input terminal of the voltage amplifier AMP inputs a common mode reference level VCM, an output terminal of the voltage amplifier AMP is connected with input terminals of the seventh transistor M7 and the eighth transistor M8, output terminals of the seventh transistor M7 and the eighth transistor M8 are connected with an output terminal of the voltage current conversion unit, and a common terminal of the seventh transistor M7 and the eighth transistor M8 is connected with a power supply.
The voltage-current conversion unit comprises a first transistor M1 and a second transistor M2, radio-frequency voltage signals are input from input ends of the first transistor M1 and the second transistor M2, output ends of the first transistor M1 and the second transistor M2 are output ends of the voltage-current conversion unit, and a common end of the first transistor M1 and the second transistor M2 is grounded.
The radio frequency intermediate frequency conversion unit comprises a third transistor M3, a fourth transistor M4, a fifth transistor M5 and a sixth transistor M6, wherein the sources of the third transistor M3 and the fourth transistor M4, the sources of the fifth transistor M5 and the sixth transistor M6 are differential input ends of the radio frequency intermediate frequency conversion unit; the drains of the third transistor M3, the fifth transistor M5, the fourth transistor M4 and the sixth transistor M6 are differential output ends of the rf if conversion unit; gate voltages are input to gates of the third transistor M3, the sixth transistor M6, the fourth transistor M4, and the fifth transistor M5.
In this embodiment, the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, the fifth transistor M5 and the sixth transistor M6 are NMOS transistors, and the input terminal thereof is a gate, the output terminal thereof is a drain, and the common terminal thereof is a source. An NPN triode can also be adopted, wherein the input end of the NPN triode is a base electrode, the output end of the NPN triode is a collector electrode, and the common end of the NPN triode is an emitter electrode.
In this embodiment, the seventh transistor M7 and the eighth transistor M8 are PMOS transistors, and the input terminal is a gate, the output terminal is a drain, and the common terminal is a source. A PNP triode can also be adopted, wherein the input end of the PNP triode is a base electrode, the output end of the PNP triode is a collector electrode, and the common end of the PNP triode is an emitter electrode.
Input radio frequency voltage signal VRFConverted into a radio frequency current signal I through transconductance transistors M1 and M2RFRadio frequency current signal IRFThe gate voltage signal of the frequency conversion transistor is V through the frequency conversion transistors M3, M4, M5 and M6LOGenerating an intermediate frequency current IIF＝GM*VRFGM is a variable-frequency transconductance, a drain terminal A of a first current source I1 is connected with a first input terminal C of the TIA, a drain terminal B of a second current source I2 is connected with a second input terminal D of the TIA, and due to the fact that the TIA is in trans-impedance dischargeThe input of the amplifier is a low-resistance, alternating current signal IIFAll the current flows into the trans-impedance amplifier, and a voltage signal output V is generated at the output end of the trans-impedance amplifierIF＝IIFR and R are resistance values of the input end and the output end of the trans-impedance amplifier, and because the two points A and B do not generate voltage amplification, the defect that the output amplitude of the traditional active mixer is limited is overcome.
In addition, the drain terminals a and B of the current sources are connected to two positive input terminals of the voltage amplifier AMP, the negative input terminal is connected to the common mode reference level VCM, the output terminal of the voltage amplifier is connected to the seventh transistor M7 and the eighth transistor M8, the drain terminals of the seventh transistor M7 and the eighth transistor M8 are connected to the drain terminals of the first transistor M1 and the second transistor M2, respectively, to form a common mode feedback loop, when the gain of the voltage amplifier AMP is large enough, the positive and negative input terminals of the voltage amplifier will form a virtual short, that is, VCM × (VA + VB) is satisfied, VA and VB are voltages at a point a and B point B, respectively, thereby stabilizing the output common mode voltage, solving the problem that the output common mode voltage of the conventional active mixer varies with process angle and temperature, and further improving the linearity of the active mixer.
Claims (9)
1. A high-linearity active mixer with common-mode feedback is characterized by comprising a voltage-current conversion unit, a radio frequency intermediate frequency conversion unit, a first current source, a second current source, a transimpedance amplifier and a common-mode feedback unit, wherein a radio frequency voltage signal is input into the input end of the voltage-current conversion unit, and the output end of the voltage-current conversion unit is connected with the input end of the radio frequency intermediate frequency conversion unit; the differential output end of the radio frequency intermediate frequency conversion unit is connected with the drain end of the first current source and the drain end of the second current source respectively, the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the transimpedance amplifier, and the differential output end of the radio frequency intermediate frequency conversion unit is connected with the input end of the common mode feedback unit; the output end of the common mode feedback unit is connected with the output end of the voltage-current conversion unit; and the output end of the trans-impedance amplifier outputs a voltage output signal.
2. The active mixer with high linearity of the common-mode feedback of claim 1, wherein the common-mode feedback unit comprises a voltage amplifier, a seventh transistor M7 and an eighth transistor M8, a drain terminal of the first current source and a drain terminal of the second current source are connected to two positive input terminals of the voltage amplifier, a negative input terminal of the voltage amplifier inputs the common-mode reference level, an output terminal of the voltage amplifier is connected to input terminals of the seventh transistor M7 and the eighth transistor M8, output terminals of the seventh transistor M7 and the eighth transistor M8 are connected to an output terminal of the voltage-current converting unit, and a common terminal of the seventh transistor M7 and the eighth transistor M8 is connected to the power supply.
3. The high linearity active mixer with common mode feedback of claim 2, wherein the seventh transistor M7 and the eighth transistor M8 are PMOS transistors, the input end of the seventh transistor M7 and the eighth transistor M8 are gates, the output end is a drain, and the common end is a source.
4. The high linearity active mixer with common mode feedback of claim 2, wherein the seventh transistor M7 and the eighth transistor M8 are PNP triodes, the input terminals of the seventh transistor M7 and the eighth transistor M8 are bases, the output terminals are collectors, and the common terminal is an emitter.
5. A high linearity active mixer with common mode feedback as claimed in any one of claims 1 to 4, wherein said voltage-current conversion unit comprises a first transistor M1 and a second transistor M2, a radio frequency voltage signal is inputted from the input terminals of the first transistor M1 and the second transistor M2, the output terminals of the first transistor M1 and the second transistor M2 are the output terminals of the voltage-current conversion unit, and the common terminal of the first transistor M1 and the second transistor M2 is grounded.
6. The active mixer of claim 5 with high linearity of the common-mode feedback, wherein the first transistor M1 and the second transistor M2 are NMOS transistors, the input terminals of the first transistor M1 and the second transistor M2 are gates, the output terminals are drains, and the common terminal is a source.
7. The active mixer of claim 5 with high linearity of the common-mode feedback, wherein the first transistor M1 and the second transistor M2 are NPN transistors, the input terminals of the first transistor M1 and the second transistor M2 are bases, the output terminals are collectors, and the common terminal is an emitter.
8. The high linearity active mixer with common mode feedback of any one of claims 1 to 4, wherein the RF IF conversion unit comprises a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a source of the third transistor M3, a source of the fourth transistor M4 and a source of the fifth transistor M5, a source of the sixth transistor M6 are differential inputs of the RF IF conversion unit; the drains of the third transistor M3, the fifth transistor M5, the fourth transistor M4 and the sixth transistor M6 are differential output ends of the rf if conversion unit; gate voltages are input to gates of the third transistor M3, the sixth transistor M6, the fourth transistor M4, and the fifth transistor M5.
9. The high linearity active mixer with common mode feedback of claim 9, wherein the third transistor M3, the fourth transistor M4, the fifth transistor M5 and the sixth transistor M6 are NMOS transistors or NPN transistors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112564639A (en) * | 2020-12-02 | 2021-03-26 | 广东美的白色家电技术创新中心有限公司 | Electrical equipment, electronic device and differential amplification circuit thereof |
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| CN112564639B (en) * | 2020-12-02 | 2024-06-07 | 广东美的白色家电技术创新中心有限公司 | Electrical equipment, electronic device and differential amplifying circuit thereof |
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