CN206542378U - A kind of frequency mixer for broadband low intermediate frequency receiver - Google Patents
A kind of frequency mixer for broadband low intermediate frequency receiver Download PDFInfo
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- CN206542378U CN206542378U CN201720025382.2U CN201720025382U CN206542378U CN 206542378 U CN206542378 U CN 206542378U CN 201720025382 U CN201720025382 U CN 201720025382U CN 206542378 U CN206542378 U CN 206542378U
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Abstract
The utility model discloses a kind of frequency mixer for broadband low intermediate frequency receiver, solve the weak point for the active mixer that existing Gilbert element circuits are constituted, local oscillator drive circuit is used as by integrated local oscillation signal frequency divider, high-quality and phase-adjustable section local oscillation signal is provided to improve the performance of frequency mixer, its amplitude is adjusted using intermediate frequency variable gain amplifying circuit simultaneously, improve the Image-rejection ration performance of receiver, whole mixer architecture has low-power consumption, higher noiseproof feature and higher mirror image rejection, it is provided with quadrature mixer circuit, local oscillator 2 divides drive circuit and intermediate frequency variable gain amplifying circuit, quadrature mixer circuit divides drive circuit with local oscillator 2 respectively and intermediate frequency variable gain amplifying circuit is connected；The load stage circuit being sequentially connected, switch switching stage circuit, transconductance stage circuit and tail current source circuit are provided with quadrature mixer circuit, and load stage circuit is the load stage circuit of RC parallel constructions.
Description
Technical field
The utility model is related to electronic technology, integrated circuit technique, broadband Low Medium Frequency, zero intermediate frequency technology, local oscillation signal
The technical fields such as frequency splitting technology, IQVGA (IQ variable gain amplifiers), are that one kind connects for broadband Low Medium Frequency specifically
The frequency mixer of receipts machine.
Background technology
Frequency mixer (MIXER) circuit is the module of a frequency conversion, in wireless communications in a consequence.
In receiver, radiofrequency signal is converted to middle low frequency signal by frequency mixer, to realize signal transacting and information extraction；In emitter,
Middle low frequency signal is converted to radiofrequency signal and sent by frequency mixer, to realize that signal is transmitted.
The performance parameter of frequency mixer mainly has following：
1. noise, electric current thermal noise and 1/f when the noise source of active mixer is mainly switching transistor conducting are made an uproar
Sound, the electric current thermal noise of transconductance stage transistor and load stage Resistance Thermal Noise and tail current source class electrical current heat noise.
2. conversion loss (gain), general definition produce postiive gain for active mixer, produce negative gain to be passive
Frequency mixer, gain can select mixer architecture type according to system requirements.
3. the linearity, is typically weighed with 1dB compression points, RF input power is when much smaller than local oscillation power, frequency mixer
It is Linear Amplifer, when RF input power continues to increase, frequency mixer can enter nonlinear area, when power output deviated line
Property 1dB when input power value as input 1dB compression points, the value is bigger, more late, the line that represents that frequency mixer enters nonlinear area
Property degree is better.
4. isolation, it refer to it is mutually isolated between each port of frequency mixer, including radio frequency and local oscillator, radio frequency and intermediate frequency, this
Shake and intermediate frequency, the parameter shows the degree of disturbance between each port frequency.
Mixer structure is broadly divided into active mixer and the major class of passive frequency mixer two.And active mixer is most of
The circuit structure that structure is all based on the progress of Gilbert units extends to realize higher performance requirement.Gilbert units electricity
Road is as shown in figure 1, its circuit is broadly divided into load stage, switch switching stage, transconductance stage and tail current source class.Its main operational principle
It is that RF radio frequency voltage signals are converted to current signal by transconductance stage circuit, switch switching stage enters local oscillation signal with RF current signals
Row mixing output current intermediate frequency signal, passes through load stage circuit output voltage intermediate frequency signal.But this circuit can not be effective
The problems such as solving high Image-rejection ration, the low noise of receiver.
Utility model content
The purpose of this utility model is to design a kind of frequency mixer for broadband low intermediate frequency receiver, solved existing
The weak point for the active mixer that Gilbert element circuits are constituted, is used as local oscillator by integrated local oscillation signal frequency divider and drives
Circuit is moved there is provided high-quality and phase-adjustable section local oscillation signal to improve the performance of frequency mixer, while increasing using intermediate frequency variable
Beneficial amplifying circuit (VGA) is adjusted to its amplitude, improves the Image-rejection ration performance of receiver, and whole mixer architecture has
Low-power consumption, higher noiseproof feature and higher mirror image rejection.
The utility model is achieved through the following technical solutions：A kind of frequency mixer for broadband low intermediate frequency receiver, if
It is equipped with quadrature mixer circuit, the frequency dividing drive circuit of local oscillator 2 and intermediate frequency variable gain amplifying circuit, the quadrature mixer circuit
Drive circuit is divided with local oscillator 2 and intermediate frequency variable gain amplifying circuit is connected respectively；It is provided with quadrature mixer circuit
Load stage circuit, switch switching stage circuit, transconductance stage circuit and the tail current source circuit being sequentially connected, and load stage circuit is RC
The load stage circuit of parallel construction.
It is further for the utility model is better achieved, using IQ two-way load model replace single ohmic load structure from
And functions of low-pass filter is played on the basis of loading functional, to filter out the high frequency spurs point caused by frequency conversion
Amount, and the switch switching stage circuit of IQ two-way can be used, frequency conversion is carried out, especially using following setting structures：It is described negative
Carrying level circuit includes I roads load stage circuit and Q roads load stage circuit, and switch switching stage circuit includes I way switch level conversion circuits
With Q way switch switching stage circuits, and I roads load stage circuit connection I way switch switching stage circuits, Q roads load stage circuit connection Q roads
Switching stage circuit is switched, I way switch level conversion circuits and Q way switch switching stage circuits are all connected with transconductance stage circuit.
Further is that the utility model is better achieved, and RC parallel construction solutions can be utilized on the load stage circuit of I roads
The deficiency of certainly existing single electric resistance structure, and the effect of low pass filter is played, so as to filter out high caused by frequency conversion
Frequency clutter component, and effectively save chip area and cost, especially using following setting structures：The I roads load stage circuit bag
Include the first RC parallel circuits and the 2nd RC parallel circuits, the of the first end of the first RC parallel circuits and the 2nd RC parallel circuits
One end connects altogether, and the second end of the first RC parallel circuits and the second end of the 2nd RC parallel circuits and I way switch switching stage circuits
It is connected；First RC parallel circuits include resistance R1 and electric capacity C1, and the 2nd RC parallel circuits include resistance R2 and electric capacity C2.
Further is that the utility model is better achieved, and RC parallel construction solutions can be utilized on the load stage circuit of Q roads
The deficiency of certainly existing single electric resistance structure, and the effect of low pass filter is played, so as to filter out high caused by frequency conversion
Frequency clutter component, and effectively save chip area and cost, especially using following setting structures：The Q roads load stage circuit bag
Include the 3rd RC parallel circuits and the 4th RC parallel circuits, the first end of the 3rd RC parallel circuits and the first of the 4th RC parallel circuits
End connects altogether, and the second end of the 3rd RC parallel circuits and the second end of the 4th RC parallel circuits and Q way switch switching stage circuit phases
Connection, the 3rd RC parallel circuits include resistance R3 and electric capacity C3, and the 4th RC parallel circuits include resistance R4 and electric capacity C4.
It is further whole circuit structure to be powered for the utility model is better achieved, under especially using
State setting structure：The first ends of first RC parallel circuits, the first end of the 2nd RC parallel circuits, the first of the 3rd RC parallel circuits
The first end of end and the 4th RC parallel circuits connects and is connected with power vd D altogether.
Further is that the utility model is better achieved, and difference local oscillation signal ILO+ and ILO- can be connected into first
Differential amplifier circuit and the second differential amplifier circuit, are mixed with what transconductance stage circuit output came depending on current radio frequency signal,
So as to export intermediate frequency differential current signal, especially using following setting structures：The I way switch switching stage circuit includes mutual
The first differential amplifier circuit and the second differential amplifier circuit of connection, and the first differential amplifier circuit and the first RC parallel circuit phases
Connection, the second differential amplifier circuit and the 2nd RC parallel circuits are connected；First differential amplifier circuit includes transistor M3 and crystalline substance
Body pipe M4, the second differential amplifier circuit includes transistor M5 and transistor M6, transistor M3 drain electrode and transistor M5 drain electrode
All be connected with the first RC parallel circuits, transistor M4 drain electrode and transistor M6 drain electrode all with the 2nd RC parallel circuit phases
Connection, transistor M4 is connected with transistor M5 grid and constitutes ILO- ends, transistor M3 grid and transistor M6 grid
Pole constitutes ILO+ ends, transistor M3 source electrode and transistor M4 source electrode connect altogether and with Q way switch switching stage circuits and transconductance stage
Circuit is connected, and transistor M5 and transistor M6 source electrode connect and is connected with Q way switch switching stage circuits and transconductance stage circuit altogether
Connect.
Further is that the utility model is better achieved, can be by the difference after local oscillator 2 divide drive circuit processing
Divide local oscillation signal (I roads) to be input to the first differential amplifier circuit and the second differential amplifier circuit, come with transconductance stage circuit output
Be mixed depending on current radio frequency signal, so that intermediate frequency differential current signal is exported, especially using following setting structures：It is described
ILO+ ends and ILO- ends are all connected with the frequency dividing drive circuit of local oscillator 2.
Further is that the utility model is better achieved, and difference local oscillation signal QLO+ and QLO- can be connected into first
Differential amplifier circuit and the second differential amplifier circuit, are mixed with what transconductance stage circuit output came depending on current radio frequency signal,
So as to export intermediate frequency differential current signal, especially using following setting structures：The Q way switch switching stage circuit includes mutually interconnecting
The 3rd differential amplifier circuit connect and the 4th differential amplifier circuit, and the 3rd differential amplifier circuit and the 3rd RC parallel circuits are connected
Connect, the 4th differential amplifier circuit and the 4th RC parallel circuits are connected；3rd differential amplifier circuit includes transistor M7 and crystal
Pipe M8, the second differential amplifier circuit includes transistor M9 and transistor M10, and transistor M7 drain electrode and transistor M9 drain electrode are all
It is connected with the 3rd RC parallel circuits, transistor M8 drain electrode and transistor M10 drain electrode are all connected with the 4th RC parallel circuits
Connect, transistor M8 is connected with transistor M9 grid and constitutes QLO- ends, transistor M7 grid and transistor M10 grid
Pole constitutes QLO+ ends, transistor M7 source electrode and transistor M8 source electrode connect altogether and with I way switch switching stage circuits and transconductance stage
Circuit is connected, transistor M9 and transistor M10 source electrode connect altogether and with I way switch switching stage circuits and transconductance stage circuit phase
Connection.
Further is that the utility model is better achieved, can be by the difference after local oscillator 2 divide drive circuit processing
Divide local oscillation signal (Q roads) to be input to the first differential amplifier circuit and the second differential amplifier circuit, come with transconductance stage circuit output
Be mixed depending on current radio frequency signal, so that intermediate frequency differential current signal is exported, especially using following setting structures：It is described
QLO- ends and QLO+ ends are all connected with the frequency dividing drive circuit of local oscillator 2.
It is further for the utility model is better achieved, by mirror current source can be by IBIAS (bias current)
Electric current needed for transconductance stage circuit output, especially using following setting structures：The tail current source circuit include by transistor M21 and
The mirror current source that transistor M22 is constituted, the grid of the transistor M21 and transistor M22 connects and is connected with IBIAS altogether
Connect, transistor M21 and transistor M22 source electrode connect and are grounded altogether, and transistor M22 drain electrode is connected with transconductance stage circuit, it is brilliant
Body pipe M21 drain electrode connection IBIAS.
The utility model compared with prior art, with advantages below and beneficial effect：
(1) the utility model solves the weak point for the active mixer that existing Gilbert element circuits are constituted, and passes through
Integrated local oscillation signal frequency divider is as local oscillator drive circuit there is provided high-quality and phase-adjustable section local oscillation signal to improve mixing
The performance of device, while being adjusted using intermediate frequency variable gain amplifying circuit (VGA) to its amplitude, improves the mirror image suppression of receiver
System performance, whole mixer architecture has low-power consumption, higher noiseproof feature and higher mirror image rejection.
(2) what the utility model was provided is used for broadband Low Medium Frequency, the mixer of zero intermediate frequency reciver, can provide
The performances such as the higher linearity, relatively low noise coefficient and higher isolation；The frequency dividing circuit of local oscillator 2 is also integrated with simultaneously, it is right
Improve the noiseproof feature of frequency mixer while phase is calibrated using low pass filter；Integrated IQVGA circuits carry out IQ two-way
The amplitude calibration of signal, improves the mirror image rejection of system.
Brief description of the drawings
Fig. 1 is traditional Gilbert element circuit structural representations
Fig. 2 is system schematic of the present utility model.
Fig. 3 is quadrature mixer circuit schematic diagram described in the utility model.
Fig. 4 is that local oscillator 2 described in the utility model divides drive circuit figure.
Fig. 5 is intermediate frequency variable gain amplification circuit diagram described in the utility model.
Fig. 6 is the circuit structure of the operational amplifier OPA in intermediate frequency variable gain amplifying circuit described in the utility model
Schematic diagram.
Wherein, reference is as follows：1- load stage circuits, 2- switch switching stage circuits, 3- transconductance stage circuits, 4- tails
Current source circuit
Embodiment
The utility model is described in further detail with reference to embodiment, but embodiment of the present utility model is not
It is limited to this.
Embodiment 1：
The utility model proposes a kind of frequency mixer for broadband low intermediate frequency receiver, existing Gilbert is solved mono-
The weak point for the active mixer that first circuit is constituted, is used as local oscillator drive circuit by integrated local oscillation signal frequency divider, carries
For high-quality and phase-adjustable section local oscillation signal to improve the performance of frequency mixer, while using intermediate frequency variable gain amplifying circuit
(VGA) its amplitude is adjusted, improve receiver Image-rejection ration performance, whole mixer architecture have low-power consumption, compared with
High noiseproof feature and higher mirror image rejection, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, are especially set using following
Structure：Quadrature mixer circuit, the frequency dividing drive circuit of local oscillator 2 and intermediate frequency variable gain amplifying circuit are provided with, it is described orthogonal mixed
Frequency device circuit divides drive circuit with local oscillator 2 respectively and intermediate frequency variable gain amplifying circuit is connected；In quadrature mixer circuit
Inside it is provided with the load stage circuit being sequentially connected, switch switching stage circuit, transconductance stage circuit and tail current source circuit, and load stage
Circuit is the load stage circuit of RC parallel constructions.
The frequency dividing drive circuit of local oscillator 2 (Div2) is that orthogonal mixting circuit (Mixer) provides orthogonal local oscillation drive signal, and this is just
Handing over the phase of local oscillation signal can be adjusted by Div2, and orthogonal mixting circuit completes rf frequency to the conversion of IF-FRE,
Obtained orthogonal intermediate-freuqncy signal is amplified with amplitude adjusted to improve reception by intermediate frequency variable gain amplifying circuit (VGA)
Machine Image-rejection ration；When the frequency mixer works, radio-frequency differential voltage signal is input to transconductance stage circuit (transistor M1 and M2 grid
Pole), output current signal to switch switching stage circuit (source electrode of switch switching stage circuit transistor)；The difference local oscillator of IQ two-way
Signal is separately input to switch switching stage circuit (grid of switch switching stage circuit transistor), then enters line frequency with radiofrequency signal
Rate is changed, and exports intermediate frequency differential IQ signal, then pass through load stage circuit output intermediate frequency differential voltage signal.
Embodiment 2：
The present embodiment is further optimized on the basis of above-described embodiment, further new for this practicality is better achieved
Type, replaces single ohmic load structure to play low pass filter work(on the basis of loading functional using IQ two-way load model
Can, to filter out the high frequency spurs component caused by frequency conversion, and the switch switching stage circuit of IQ two-way can be used,
Frequency conversion is carried out, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The load stage circuit bag
I roads load stage circuit and Q roads load stage circuit are included, switch switching stage circuit includes I way switch level conversion circuits and Q way switch turns
Change a grade circuit, and I roads load stage circuit connection I way switch switching stage circuits, Q roads load stage circuit connection Q way switch switching stages
Circuit, I way switch level conversion circuits and Q way switch switching stage circuits are all connected with transconductance stage circuit.
Embodiment 3：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, the deficiency of existing single electric resistance structure can be solved using RC parallel constructions on the load stage circuit of I roads, and play low pass
The effect of wave filter, so as to filter out the high frequency spurs component caused by frequency conversion, and effectively save chip area and into
This, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The I roads load stage circuit includes the first RC
Parallel circuit and the 2nd RC parallel circuits, the first end of the first RC parallel circuits and the first end of the 2nd RC parallel circuits connect altogether,
And the first RC parallel circuits the second end and the second end of the 2nd RC parallel circuits be connected with I way switch switching stage circuits；The
One RC parallel circuits include resistance R1 and electric capacity C1, and the 2nd RC parallel circuits include resistance R2 and electric capacity C2.
Embodiment 4：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, the deficiency of existing single electric resistance structure can be solved using RC parallel constructions on the load stage circuit of Q roads, and play low pass
The effect of wave filter, so as to filter out the high frequency spurs component caused by frequency conversion, and effectively save chip area and into
This, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The Q roads load stage circuit includes the 3rd RC
Parallel circuit and the 4th RC parallel circuits, the first end of the 3rd RC parallel circuits and the first end of the 4th RC parallel circuits connect altogether,
And the 3rd RC parallel circuits the second end and the second end of the 4th RC parallel circuits be connected with Q way switch switching stage circuits,
Three RC parallel circuits include resistance R3 and electric capacity C3, and the 4th RC parallel circuits include resistance R4 and electric capacity C4.
Embodiment 5：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, whole circuit structure can be powered, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially be set using following
Structure：First end, the first end of the 2nd RC parallel circuits, the first end of the 3rd RC parallel circuits of the first RC parallel circuits
Connect and be connected with power vd D altogether with the first end of the 4th RC parallel circuits.
Embodiment 6：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, difference local oscillation signal ILO+ and ILO- can be connected to the first differential amplifier circuit and the second differential amplifier circuit,
It is mixed with what transconductance stage circuit output came depending on current radio frequency signal, so that intermediate frequency differential current signal is exported, such as Fig. 2,
Shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The I way switch switching stage circuit includes what is be connected with each other
First differential amplifier circuit and the second differential amplifier circuit, and the first differential amplifier circuit is connected with the first RC parallel circuits,
Second differential amplifier circuit and the 2nd RC parallel circuits are connected；First differential amplifier circuit includes transistor M3 and transistor
M4, the second differential amplifier circuit includes transistor M5 and transistor M6, transistor M3 drain electrode and transistor M5 drain electrode all with
First RC parallel circuits are connected, and transistor M4 drain electrode and transistor M6 drain electrode are all connected with the 2nd RC parallel circuits,
Transistor M4 is connected with transistor M5 grid and constitutes ILO- ends, transistor M3 grid and transistor M6 grid structure
Into ILO+ ends, transistor M3 source electrode and transistor M4 source electrode connect altogether and with Q way switch switching stage circuits and transconductance stage circuit
It is connected, transistor M5 and transistor M6 source electrode connect and is connected with Q way switch switching stage circuits and transconductance stage circuit altogether.
Embodiment 7：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, the difference local oscillation signal (I roads) after local oscillator 2 divides drive circuit processing can be input to the first difference and put
Big circuit and the second differential amplifier circuit, are mixed with what transconductance stage circuit output came depending on current radio frequency signal, so that defeated
Go out intermediate frequency differential current signal, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The ILO+ ends
All it is connected with ILO- ends with the frequency dividing drive circuit of local oscillator 2.
Embodiment 8：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, difference local oscillation signal QLO+ and QLO- can be connected to the first differential amplifier circuit and the second differential amplifier circuit,
It is mixed with what transconductance stage circuit output came depending on current radio frequency signal, so that intermediate frequency differential current signal is exported, such as Fig. 2,
Shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The Q way switch switching stage circuit includes what is be connected with each other
3rd differential amplifier circuit and the 4th differential amplifier circuit, and the 3rd differential amplifier circuit and the 3rd RC parallel circuits be connected,
4th differential amplifier circuit and the 4th RC parallel circuits are connected；3rd differential amplifier circuit includes transistor M7 and transistor
M8, the second differential amplifier circuit includes transistor M9 and transistor M10, transistor M7 drain electrode and transistor M9 drain electrode all with
3rd RC parallel circuits are connected, and transistor M8 drain electrode and transistor M10 drain electrode are all connected with the 4th RC parallel circuits
Connect, transistor M8 is connected with transistor M9 grid and constitutes QLO- ends, transistor M7 grid and transistor M10 grid
QLO+ ends are constituted, transistor M7 source electrode and transistor M8 source electrode connect and electric with I way switch switching stage circuits and transconductance stage altogether
Road is connected, and transistor M9 and transistor M10 source electrode connect and is connected with I way switch switching stage circuits and transconductance stage circuit altogether
Connect.
Embodiment 9：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, the difference local oscillation signal (Q roads) after local oscillator 2 divides drive circuit processing can be input to the first difference and put
Big circuit and the second differential amplifier circuit, are mixed with what transconductance stage circuit output came depending on current radio frequency signal, so that defeated
Go out intermediate frequency differential current signal, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The QLO- ends
All it is connected with QLO+ ends with the frequency dividing drive circuit of local oscillator 2.
Embodiment 10：
The present embodiment is further optimized on the basis of any of the above-described embodiment, and further is that this reality is better achieved
With new, can by IBIAS (bias current) by mirror current source the electric current for needed for transconductance stage circuit output, such as Fig. 2, Fig. 3,
Shown in Fig. 4, Fig. 5, Fig. 6, especially using following setting structures：The tail current source circuit is included by transistor M21 and transistor
The mirror current source that M22 is constituted, the grid of the transistor M21 and transistor M22 connects and is connected with IBIAS altogether, crystal
Pipe M21 and transistor M22 source electrode connect and are grounded altogether, and transistor M22 drain electrode is connected with transconductance stage circuit, transistor M21
Drain electrode connection IBIAS.
The transconductance stage circuit is provided with transistor M1 and transistor M2, transistor M1 drain electrode respectively with transistor M3,
Transistor M4, transistor M7, transistor M8 source electrode are connected, and transistor M1 and transistor M2 source electrode are connected and and crystal
Pipe M22 drain electrode is connected, transistor M2 drain electrode respectively with transistor M5, transistor M6, transistor M9 and transistor M10
Source electrode is connected, and the radiofrequency signal RF+ of positive polarity is connected on transistor M1 grid；It is connected on transistor M2 grid negative
The radiofrequency signal RF- of polarity.
Embodiment 11：
The present embodiment is further optimized on the basis of above-described embodiment, the frequency dividing drive circuit of local oscillator 2 as shown in Figure 4
(circuit is a kind of frequency dividing circuit of local oscillator 2 of optimization, and in actual applications, the existing frequency dividing circuit of local oscillator 2 also can be applicable to this
In utility model), wherein, IREF is bias current, and transistor M47~M52 is that mirror current source is connected with transistor M53, is
The core circuit work of the whole frequency dividing of local oscillator 2 drive circuit provides operating current.LO+ and LO- are Differential Input local oscillation signals, control
Transistor M31 processed~M34 carries out current switching.Transistor M35, M36 grid are Differential Input data-signal, during by one
The clock cycle is delivered to the source follower being made up of transistor M45, M46 and M51, M52；Resistance R is that there is provided static state for load resistance
Biasing.Transistor M37, M38 and M41, M42 are positive feedback type of attachment, constitute latch structure dynamical save signal；Source electrode with
The driving force of the circuit is improved with device M43~M46.Transistor M39, M40 drain terminal signal are coupled with M36, M35 grid
Pole, so that the circuit is carried out to input clock except 2 frequency dividings.Electric capacity C5 and electric capacity C6 is capacitance, resistance R9 and resistance R10
For blocking resistance, wherein Vb1, Vb2 is bias voltage, and the phase value of output orthogonal differential signal can be changed by changing its size,
So that local oscillation signal phase turns into adjustable.Resistance R11 and electric capacity C7, resistance R12 and electric capacity C8, resistance R13 and electric capacity C9,
Resistance R14 and electric capacity C10 respectively constitute low pass filter, the square-wave signal of front stage circuits is converted to sinusoidal signal, so as to change
Kind mixer noiser performance, if in design in use, need to carry out segment processing, can also be by electric capacity C7, electric capacity C8, electric capacity
C9, electric capacity C10 make tunable capacitor to carry out frequency band selection.
Embodiment 12：
The present embodiment is further optimized on the basis of above-described embodiment, as shown in Figure 5, it is proposed that intermediate frequency variable gain
The circuit structure block diagram of amplifying circuit (VGA).Wherein, OPA is differential operational amplifier, and SW is switch, controls its electricity in parallel
Whether resistance accesses circuit, so as to change whole backfeed loop resistance value.Electric capacity C11 is that compensating electric capacity carries out frequency compensation to OPA,
Resistance (R15, R16) is feedback resistance, and R1~Rn is adjustable feedback resistance, and gain control is carried out to the circuit by SW control
System, so as to realize adjustable gain, carries out amplitude calibration to IQ two-way intermediate-freuqncy signal by the circuit, is divided with reference to local oscillator 2 respectively
The phase alignment of drive circuit, it is possible to achieve the amplitude of intermediate-freuqncy signal is consistent, phase is completely orthogonal, so as to improve the mirror of receiver
As rejection.
It is illustrated in figure 6 the electrical block diagram of operational amplifier OPA in intermediate frequency variable gain amplifying circuit (VGA).
Wherein, transistor M61 and M62 amplifies as input stage input signal INP, INN, M65 and M66 as the second level, output signal
OUTP, OUTN, are the Full differential operational amplifiers of a two-stage structure for amplifying.Transistor M67~M70, resistance R1, electric capacity C1 with
And transistor M72 collectively forms common mode electrical level negative feedback control circuit, is acted on by operational amplifier, make OUTP, OUTN electricity
It is flat equal with common mode electrical level Vcom.IB is bias current, and transistor M71 and M72~M75 constitutes mirror current source, is that computing is put
Big device provides electric current output.Resistance RC is miller compensation resistance capacitance.
It is described above, only it is preferred embodiment of the present utility model, any formal limit is not done to the utility model
System, every any simple modification made according to technical spirit of the present utility model to above example, equivalent variations are each fallen within
Within protection domain of the present utility model.
Claims (10)
1. a kind of frequency mixer for broadband low intermediate frequency receiver, it is characterised in that：It is provided with quadrature mixer circuit, local oscillator
2 frequency dividing drive circuits and intermediate frequency variable gain amplifying circuit, the quadrature mixer circuit divide drive circuit with local oscillator 2 respectively
And intermediate frequency variable gain amplifying circuit is connected；The load stage circuit being sequentially connected is provided with quadrature mixer circuit, is opened
Switching stage circuit, transconductance stage circuit and tail current source circuit are closed, and load stage circuit is the load stage circuit of RC parallel constructions.
2. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 1, it is characterised in that：It is described negative
Carrying level circuit includes I roads load stage circuit and Q roads load stage circuit, and switch switching stage circuit includes I way switch level conversion circuits
With Q way switch switching stage circuits, and I roads load stage circuit connection I way switch switching stage circuits, Q roads load stage circuit connection Q roads
Switching stage circuit is switched, I way switch level conversion circuits and Q way switch switching stage circuits are all connected with transconductance stage circuit.
3. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 2, it is characterised in that：The I
Road load stage circuit includes the first RC parallel circuits and the 2nd RC parallel circuits, the first end and the 2nd RC of the first RC parallel circuits
The first end of parallel circuit is connect altogether, and the second end of the first RC parallel circuits and the second end of the 2nd RC parallel circuits are opened with I roads
Switching stage circuit is closed to be connected；First RC parallel circuits include resistance R1 and electric capacity C1, and the 2nd RC parallel circuits include resistance R2
With electric capacity C2.
4. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 3, it is characterised in that：The Q
Road load stage circuit includes the 3rd RC parallel circuits and the 4th RC parallel circuits, the first end and the 4th RC of the 3rd RC parallel circuits
The first end of parallel circuit is connect altogether, and the second end of the 3rd RC parallel circuits and the second end of the 4th RC parallel circuits are opened with Q roads
Close switching stage circuit to be connected, the 3rd RC parallel circuits include resistance R3 and electric capacity C3, the 4th RC parallel circuits include resistance R4
With electric capacity C4.
5. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 4, it is characterised in that：Described
First end, the first end of the 2nd RC parallel circuits, the first end of the 3rd RC parallel circuits and the 4th RC of one RC parallel circuits are simultaneously
The first end of connection circuit connects and is connected with power vd D altogether.
6. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 3 or 4 or 5, it is characterised in that：
The I way switch switching stage circuit includes the first differential amplifier circuit and the second differential amplifier circuit being connected with each other, and first
Differential amplifier circuit is connected with the first RC parallel circuits, and the second differential amplifier circuit and the 2nd RC parallel circuits are connected；The
One differential amplifier circuit includes transistor M3 and transistor M4, and the second differential amplifier circuit includes transistor M5 and transistor M6,
Transistor M3 drain electrode and transistor M5 drain electrode are all connected with the first RC parallel circuits, transistor M4 drain electrode and transistor
M6 drain electrode is all connected with the 2nd RC parallel circuits, and transistor M4 is connected with transistor M5 grid and constitutes ILO- ends,
Transistor M3 grid and transistor M6 grid constitute ILO+ ends, transistor M3 source electrode and transistor M4 source electrode connect altogether and
Be connected with Q way switch switching stage circuits and transconductance stage circuit, transistor M5 and transistor M6 source electrode connect altogether and with Q way switch
Switching stage circuit and transconductance stage circuit are connected.
7. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 6, it is characterised in that：It is described
ILO+ ends and ILO- ends are all connected with the frequency dividing drive circuit of local oscillator 2.
8. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 4 or 5 or 7, it is characterised in that：
The Q way switch switching stage circuit includes the 3rd differential amplifier circuit and the 4th differential amplifier circuit being connected with each other, and the 3rd
Differential amplifier circuit and the 3rd RC parallel circuits are connected, and the 4th differential amplifier circuit and the 4th RC parallel circuits are connected；The
Three differential amplifier circuits include transistor M7 and transistor M8, and the second differential amplifier circuit includes transistor M9 and transistor M10,
Transistor M7 drain electrode and transistor M9 drain electrode are all connected with the 3rd RC parallel circuits, transistor M8 drain electrode and transistor
M10 drain electrode is all connected with the 4th RC parallel circuits, and transistor M8 is connected with transistor M9 grid and constitutes QLO- ends,
Transistor M7 grid and transistor M10 grid constitute QLO+ ends, and transistor M7 source electrode and transistor M8 source electrode connect altogether
And be connected with I way switch switching stage circuits and transconductance stage circuit, transistor M9 and transistor M10 source electrode connect altogether and with I roads
Switch switching stage circuit and transconductance stage circuit are connected.
9. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 8, it is characterised in that：It is described
QLO- ends and QLO+ ends are all connected with the frequency dividing drive circuit of local oscillator 2.
10. a kind of frequency mixer for broadband low intermediate frequency receiver according to claim 9, it is characterised in that：It is described
Tail current source circuit includes the mirror current source being made up of transistor M21 and transistor M22, the transistor M21 and crystal
Pipe M22 grid connects and is connected with IBIAS altogether, and transistor M21 and transistor M22 source electrode connect and are grounded altogether, transistor M22
Drain electrode be connected with transconductance stage circuit, transistor M21 drain electrode connection IBIAS.
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| CN108768326A (en) * | 2018-08-31 | 2018-11-06 | 上海迦美信芯通讯技术有限公司 | Fine gain step size controlling amplifier and navigation neceiver |
| CN108832946A (en) * | 2018-07-17 | 2018-11-16 | 深圳骏通微集成电路设计有限公司 | A kind of RF receiving circuit and radio-frequency transmitter |
| CN109450485A (en) * | 2018-12-07 | 2019-03-08 | 中国电子科技集团公司第五十四研究所 | A kind of Analog Baseband calibration of amplitude and phase and local-oscillator leakage suppression circuit |
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| CN115694370A (en) * | 2022-12-30 | 2023-02-03 | 中国航天科工集团八五一一研究所 | Fully differential cross-coupled multi-gate transconductance Gilbert mixer circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108832946A (en) * | 2018-07-17 | 2018-11-16 | 深圳骏通微集成电路设计有限公司 | A kind of RF receiving circuit and radio-frequency transmitter |
| CN108768326A (en) * | 2018-08-31 | 2018-11-06 | 上海迦美信芯通讯技术有限公司 | Fine gain step size controlling amplifier and navigation neceiver |
| CN109450485A (en) * | 2018-12-07 | 2019-03-08 | 中国电子科技集团公司第五十四研究所 | A kind of Analog Baseband calibration of amplitude and phase and local-oscillator leakage suppression circuit |
| CN109450485B (en) * | 2018-12-07 | 2024-04-09 | 中国电子科技集团公司第五十四研究所 | Analog baseband amplitude and phase calibration and local oscillator leakage suppression circuit |
| CN109714005A (en) * | 2018-12-25 | 2019-05-03 | 电子科技大学 | A kind of restructural double frequency-band frequency mixer |
| CN109714005B (en) * | 2018-12-25 | 2021-03-02 | 电子科技大学 | Reconfigurable dual-band mixer |
| CN110764061A (en) * | 2019-10-31 | 2020-02-07 | 北京无线电测量研究所 | Orthogonal frequency conversion receiver |
| CN111416586A (en) * | 2020-04-03 | 2020-07-14 | 杭州易百德微电子有限公司 | Load structure and radio frequency amplifier formed by same |
| US11750180B2 (en) | 2021-09-08 | 2023-09-05 | International Business Machines Corporation | High frequency AC coupled self-biased divider |
| CN115694370A (en) * | 2022-12-30 | 2023-02-03 | 中国航天科工集团八五一一研究所 | Fully differential cross-coupled multi-gate transconductance Gilbert mixer circuit |
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