CN104935259A

CN104935259A - Folding orthogonal double balanced mixer

Info

Publication number: CN104935259A
Application number: CN201510299059.XA
Authority: CN
Inventors: 李迪; 柴常春; 王瑜; 石佐辰; 房涛; 赵中阳; 杨银堂
Original assignee: Xidian University
Current assignee: Xidian University
Priority date: 2015-06-03
Filing date: 2015-06-03
Publication date: 2015-09-23
Anticipated expiration: 2035-06-03
Also published as: CN104935259B

Abstract

The invention relates to a folding orthogonal double balanced mixer. The folding orthogonal double balanced mixer comprises a transconductance grade module, a switch grade module, a tail current source module, a load current source module and a common mode feedback module. The load current source module comprises transistors M1 and M2, the tail current source module comprises transistors M11 and M12, the switch grade module comprises transistors M3, M4, M5, M6, M7, M8, M9 and M10, and the transconductance grade module comprises transistors M13, M14, M15 and M16. According to the invention, the folded switch grade module is used for improving the isolation among ports; the current source load module is used for improving the gains of a frequency mixer; the common mold feedback module is used for providing stale working currents for each key node of the frequency mixer and improving the linearity of the frequency mixer; and besides, same-phase and orthogonal frequency mixer braches share one group of radio frequency input ports so that power consumption is reduced while orthogonal frequency mixing is realized.

Description

A kind of folding Orthogonal Double balanced mixer

Technical field

The present invention relates to frequency mixer field, be specifically related to a kind of folding Orthogonal Double balanced mixer.

Background technology

Frequency mixer is as one of important module in wireless communication transceiver, and its effect is the frequency translation carrying out signal.In transmitters, its effect is up-conversion, moves higher carrier wave frequency range by modulated intermediate-freuqncy signal; In receivers, its effect is down-conversion, radiofrequency signal is moved medium and low frequency section.Two balanced structures of previous frequency mixer many employings Gilbert cell, the each interport isolation of frequency mixer of this structure is poor, when needing conversion gain and the reduction noise increasing frequency mixer, need the bias current increasing transconductance stage, and the pressure drop caused in load increases by the increase of bias current, thus have compressed the voltage space of switching stage and transconductance stage, reduce the linearity of frequency mixer.Signal many employings Quadrature Phase Shift Keying of Modern Communication System or similar orthogonal frequency displacement key modulation techniques, receiver needs radiofrequency signal to move into homophase and orthogonal two paths of signals, usually this is realized by use two gilbert mixer or the parallel connection of similar frequency mixer, but large power consumption can be produced like this, be not suitable for the requirement of electronics miniaturization, portability, low-power consumption.

Summary of the invention

Object of the present invention is just to provide a kind of folding Orthogonal Double balanced mixer, and it can effectively solve the problem, and it can improve the linearity, the interport isolation of frequency mixer, and has the feature of high-gain and low-power consumption.

For achieving the above object, the present invention implements by the following technical solutions:

A kind of folding Orthogonal Double balanced mixer, is characterized in that: comprise transconductance stage module, switching stage module, tail current source module, load current source module and common-mode feedback module, load current source module comprises transistor M1, M2, tail current source module comprises transistor M11, M12, switching stage module comprises transistor M3, M4, M5, M6, M7, M8, M9, M10, transconductance stage module comprises transistor M13, M14, M15, M16, transistor M1, the source electrode of M2 all connects supply voltage, transistor M1, the grid of M2 is all connected to the voltage control signal output VB1 of common-mode feedback module, the drain electrode of transistor M1 divides five tunnels to connect transistor M3 respectively, M5, M7, the source electrode of M9 and the drain electrode of transistor M11, the drain electrode of transistor M2 divides five tunnels to connect transistor M4 respectively, M6, M8, the source electrode of M10 and the drain electrode of transistor M12, the grid of transistor M3, M6 connects the positive input terminal ILO+ of homophase local oscillation signal respectively, the drain electrode of transistor M3, M4, M13 be shorted together and short circuit point as the contact of homophase IF output signal output IIF, the grid of transistor M4, M5 connects the negative input end ILO-of homophase local oscillation signal respectively, the drain electrode of transistor M5, M6, M14 be shorted together and short circuit point as another contact of homophase IF output signal output IIF, the grid of transistor M7, M10 is connected respectively to the just defeated end QLO+ of orthogonal local oscillation signal, the drain electrode of transistor M7, M8, M15 be shorted together and short circuit point as the contact of orthogonal IF output signal end QIF, the grid of transistor M8, M9 all connects the negative defeated end QLO-of orthogonal local oscillation signal, the drain electrode of transistor M9, M10, M16 be shorted together and short circuit point as another contact of orthogonal IF output signal end QIF, the grid of transistor M11 connects the anode RF+ of input radio frequency signal, and the grid of transistor M12 connects the negative terminal RF-of input radio frequency signal, the grid of transistor M13, M14, M15, M16 all connects the bias voltage VB2 that external circuit provides, the source grounding of transistor M11, M12, M13, M14, M15, M16.

In technique scheme, adopt the isolation between folding switching stage module raising port; Current source load module is adopted to improve the gain of frequency mixer; Common-mode feedback module is adopted to provide stable operating current, improve the linearity of frequency mixer for each key node of frequency mixer; Homophase and orthogonal two mixer branch share one group of rf inputs mouth in addition, reduce power consumption while realizing quadrature downconvert.

Accompanying drawing explanation

Fig. 1 is circuit theory diagrams of the present invention;

Fig. 2 is the circuit theory diagrams of common-mode feedback module.

Embodiment

In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is specifically described.Should be appreciated that following word only in order to describe one or more concrete execution modes of the present invention, considered critical is not carried out to the protection range that the present invention specifically asks.

As shown in Figure 1, a kind of folding Orthogonal Double balanced mixer, comprises transconductance stage module 15, switching stage module, tail current source module 14, load current source module 11 and common-mode feedback module 16 to the technical scheme that the present invention takes, load current source module 11 comprises transistor M1, M2, tail current source module 14 comprises transistor M11, M12, switching stage module is by two Gilbert cells 12, 13 compositions, comprise transistor M3, M4, M5, M6, M7, M8, M9, M10, transconductance stage module 15 comprises transistor M13, M14, M15, M16, transistor M1, the source electrode of M2 all connects supply voltage, transistor M1, the grid of M2 is all connected to the voltage control signal output VB1 of common-mode feedback module 16, the drain electrode of transistor M1 divides five tunnels to connect transistor M3 respectively, M5, M7, the source electrode of M9 and the drain electrode of transistor M11, the drain electrode of transistor M2 divides five tunnels to connect transistor M4 respectively, M6, M8, the source electrode of M10 and the drain electrode of transistor M12, the grid of transistor M3, M6 connects the positive input terminal ILO+ of homophase local oscillation signal respectively, the drain electrode of transistor M3, M4, M13 be shorted together and short circuit point as the contact of homophase IF output signal output IIF, the grid of transistor M4, M5 connects the negative input end ILO-of homophase local oscillation signal respectively, the drain electrode of transistor M5, M6, M14 be shorted together and short circuit point as another contact of homophase IF output signal output IIF, the grid of transistor M7, M10 is connected respectively to the just defeated end QLO+ of orthogonal local oscillation signal, the drain electrode of transistor M7, M8, M15 be shorted together and short circuit point as the contact of orthogonal IF output signal end QIF, the grid of transistor M8, M9 all connects the negative defeated end QLO-of orthogonal local oscillation signal, the drain electrode of transistor M9, M10, M16 be shorted together and short circuit point as another contact of orthogonal IF output signal end QIF, the grid of transistor M11 connects the anode RF+ of input radio frequency signal, and the grid of transistor M12 connects the negative terminal RF-of input radio frequency signal, the grid of transistor M13, M14, M15, M16 all connects the bias voltage VB2 that external circuit provides, the source grounding of transistor M11, M12, M13, M14, M15, M16.Wherein: the switching stage be made up of two Gilbert cells, tail current source, load current source and common mode feedback circuit.RF+ and RF-is respectively the positive and negative input signal of frequency mixer radiofrequency signal, ILO+ and ILO-is respectively the positive and negative input signal of homophase local oscillation signal, QLO+ and QLO-is respectively the positive and negative input signal of orthogonal local oscillation signal, IIF and QIF is respectively the homophase IF output signal of frequency mixer and orthogonal IF output signal, the voltage control signal that VB1 provides for common-mode feedback module 16, the bias voltage that VB2 provides for external circuit.

The present invention adopts the isolation between folding switching stage module raising port; Current source load module is adopted to improve the gain of frequency mixer; Common-mode feedback module 16 is adopted to provide stable operating current, improve the linearity of frequency mixer for each key node of frequency mixer; Homophase and orthogonal two mixer branch share one group of rf inputs mouth in addition, reduce power consumption while realizing quadrature downconvert.

Scheme is specifically: common-mode feedback module 16 comprises transistor M17, M18, M19, M20 and resistance R1, R2, R3, R4, the source electrode of transistor M17 connects supply voltage, the grid of transistor M17 connects the bias voltage VB3 that external circuit provides, and the drain electrode of transistor M17 divides three tunnels to be connected with the source electrode of transistor M18, M19, M20 respectively; The PLUS end of resistance R1 connects input signal P, and MINUS end and the PLUS of resistance R2 of resistance R1 hold and the grid of transistor M18 links together; The MINUS end of resistance R2 connects input signal Q; The PLUS end of resistance R3 connects input signal R, and MINUS end and the PLUS of resistance R4 of resistance R3 hold and the grid of M19 is shorted together, and the MINUS end of resistance R4 connects input signal S; The drain electrode of transistor M18, M19, M21 is shorted together and short circuit point minute two-way connects the grid of transistor M21, M22 respectively, the grid of transistor M20 connects the reference voltage Vref that external circuit provides, the drain electrode of transistor M20, M22 link together and both contact as the voltage control signal output VB1 of common-mode feedback module 16; The source ground of transistor M21, M22.Transistor M18, M19 measure-alike and be the half of transistor M20.Specifically as shown in Figure 2, wherein: VB1 is the voltage control signal that common-mode feedback module 16 exports, and the reference voltage that Vref provides for external circuit, the bias voltage that VB3 provides for external circuit, P, Q, R, S are input signal.

The above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; to know in the present invention after contents; under the premise without departing from the principles of the invention; can also make some equal conversion to it and substitute, these convert on an equal basis and substitute and also should be considered as belonging to protection scope of the present invention.

Claims

1. a folding Orthogonal Double balanced mixer, is characterized in that: comprise transconductance stage module, switching stage module, tail current source module, load current source module and common-mode feedback module, load current source module comprises transistor M1, M2, tail current source module comprises transistor M11, M12, switching stage module comprises transistor M3, M4, M5, M6, M7, M8, M9, M10, transconductance stage module comprises transistor M13, M14, M15, M16, transistor M1, the source electrode of M2 all connects supply voltage, transistor M1, the grid of M2 is all connected to the voltage control signal output VB1 of common-mode feedback module, the drain electrode of transistor M1 divides five tunnels to connect transistor M3 respectively, M5, M7, the source electrode of M9 and the drain electrode of transistor M11, the drain electrode of transistor M2 divides five tunnels to connect transistor M4 respectively, M6, M8, the source electrode of M10 and the drain electrode of transistor M12, the grid of transistor M3, M6 connects the positive input terminal ILO+ of homophase local oscillation signal respectively, the drain electrode of transistor M3, M4, M13 be shorted together and short circuit point as the contact of homophase IF output signal output IIF, the grid of transistor M4, M5 connects the negative input end ILO-of homophase local oscillation signal respectively, the drain electrode of transistor M5, M6, M14 be shorted together and short circuit point as another contact of homophase IF output signal output IIF, the grid of transistor M7, M10 is connected respectively to the just defeated end QLO+ of orthogonal local oscillation signal, the drain electrode of transistor M7, M8, M15 be shorted together and short circuit point as the contact of orthogonal IF output signal end QIF, the grid of transistor M8, M9 all connects the negative defeated end QLO-of orthogonal local oscillation signal, the drain electrode of transistor M9, M10, M16 be shorted together and short circuit point as another contact of orthogonal IF output signal end QIF, the grid of transistor M11 connects the anode RF+ of input radio frequency signal, and the grid of transistor M12 connects the negative terminal RF-of input radio frequency signal, the grid of transistor M13, M14, M15, M16 all connects the bias voltage VB2 that external circuit provides, the source grounding of transistor M11, M12, M13, M14, M15, M16.

2. folding Orthogonal Double balanced mixer according to claim 1, it is characterized in that: common-mode feedback module comprises transistor M17, M18, M19, M20 and resistance R1, R2, R3, R4, the source electrode of transistor M17 connects supply voltage, the grid of transistor M17 connects the bias voltage VB3 that external circuit provides, and the drain electrode of transistor M17 divides three tunnels to be connected with the source electrode of transistor M18, M19, M20 respectively; The PLUS end of resistance R1 connects input signal P, and MINUS end and the PLUS of resistance R2 of resistance R1 hold and the grid of transistor M18 links together; The MINUS end of resistance R2 connects input signal Q; The PLUS end of resistance R3 connects input signal R, and MINUS end and the PLUS of resistance R4 of resistance R3 hold and the grid of M19 is shorted together, and the MINUS end of resistance R4 connects input signal S; The drain electrode of transistor M18, M19, M21 is shorted together and short circuit point minute two-way connects the grid of transistor M21, M22 respectively, the grid of transistor M20 connects the reference voltage Vref that external circuit provides, the drain electrode of transistor M20, M22 link together and both contact as the voltage control signal output VB1 of common-mode feedback module; The source ground of transistor M21, M22.

3. folding Orthogonal Double balanced mixer according to claim 2, is characterized in that: transistor M18, M19 measure-alike and be the half of transistor M20.