CN109450380A - A kind of active single balance mixer - Google Patents
A kind of active single balance mixer Download PDFInfo
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- CN109450380A CN109450380A CN201811123486.2A CN201811123486A CN109450380A CN 109450380 A CN109450380 A CN 109450380A CN 201811123486 A CN201811123486 A CN 201811123486A CN 109450380 A CN109450380 A CN 109450380A
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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
- H03D7/1425—Balanced arrangements with transistors
- H03D7/1441—Balanced arrangements with transistors using field-effect transistors
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Abstract
The invention discloses a kind of active single balance mixer, the port LO input signal is input to single balance mixer foundation structure after amplifying circuit, active balun and linear regulating circuit；The port RF input signal connects single balance mixer foundation structure after match circuit, biasing circuit, the single balance mixer foundation structure includes metal-oxide-semiconductor M2, M3 and M1, the grid of the metal-oxide-semiconductor M1 connects the port RF, the source electrode of metal-oxide-semiconductor M1 is grounded, the source electrode of drain electrode connection the metal-oxide-semiconductor M2 and M3 of metal-oxide-semiconductor M1, the source electrode of the grid connection metal-oxide-semiconductor M6 of the drain electrode connection DC power supply VDD and buffer of metal-oxide-semiconductor M2 and M3, metal-oxide-semiconductor M3；M1 is that input radio frequency voltage signal is converted into current signal, and M2 and M3 are able to achieve the conversion of frequency；The single balance mixer foundation structure input signal is mixed after by the new signal of generation, new signal exports after buffer is handled from the port IF, and the present invention can effectively improve the conversion gain of frequency mixer, widen bandwidth of operation.
Description
Technical field
The invention belongs to frequency mixer technical field more particularly to a kind of active single balance mixers.
Background technique
The radio-frequency front-end of transceiver mainly includes low-noise amplifier, frequency mixer, local oscillator and power amplifier etc.
Module, frequency mixer are the nucleus modules of transceiver, and each wireless communication system will at least use more than one frequency mixer, property
The requirement of the performance and system of whole system to other function module can be directly affected.Currently, as CMOS technology is to deep Asia
The development of micron, frequency mixer mainly develop to the direction of low pressure, low-power consumption, high linearity, to block frequency mixer crucial in receiver
Research, us can be made to advanced optimize the performance of system, reduce power consumption and cost, push the development of CMOS RFIC.
Whether gain is provided according to frequency mixer, frequency mixer can be divided into active mixer and passive frequency mixer.It is passive mixed
Frequency device does not provide gain, and such as or diode passive frequency mixer active mixer provides certain conversion gain, after can reduce
Contribution of the grade module to noise coefficient.Whether it is single ended input according to frequency mixer, single balance mixer can be divided into and double flat weighing apparatus is mixed
Frequency device, and voltage and power required for double balanced mixer are about twice of single balance mixer, Low-voltage Low-power
A series of low-noise amplifier of Single-end outputs used in demand and transceiver has obtained single balance mixer extensively
Research.
Summary of the invention
The present invention is insufficient according to prior art and defect, proposes a kind of active single balance mixer, it is therefore intended that mention
The conversion gain of high frequency mixer, widens bandwidth of operation.
In order to solve the above-mentioned technical problem, the technical scheme adopted by the invention is as follows:
A kind of active single balance mixer, the port LO input signal is by amplifying circuit, active balun and linear regulation electricity
Single balance mixer foundation structure is input to behind road；The port RF input signal connects Dan Ping after match circuit, biasing circuit
Weigh frequency mixer foundation structure, the single balance mixer foundation structure input signal is mixed after by the new signal of generation, it is new to believe
It is exported from the port IF number after buffer is handled；
Further, the amplifying circuit includes match circuit, biasing circuit and cascode current mirror, the cascode
Current mirror includes the grid of metal-oxide-semiconductor M4, metal-oxide-semiconductor M5 and the DC power supply port VDD, LO connection metal-oxide-semiconductor M4, and the port LO and MOS
Match circuit, biasing circuit, the source electrode ground connection of metal-oxide-semiconductor M4 are connected between the grid of pipe M4, the drain electrode of metal-oxide-semiconductor M4 connects metal-oxide-semiconductor
The source electrode of M5, the grid of metal-oxide-semiconductor M5 connect biasing circuit, the drain electrode connection DC power supply VDD of metal-oxide-semiconductor M5 and active balun；With
To adjust the impedance of RF input port and improve conversion gain and widen bandwidth of operation.
Further, the active balun includes match circuit, biasing circuit and cascode current mirror, the cascode
Current mirror includes metal-oxide-semiconductor M6, metal-oxide-semiconductor M7, the grid of the drain electrode connection metal-oxide-semiconductor M6 of metal-oxide-semiconductor M5, and drain electrode and the MOS of metal-oxide-semiconductor M5
Be connected with match circuit, biasing circuit between the grid of pipe M6, the source electrode ground connection of the metal-oxide-semiconductor M6, and with single balance mixer base
The metal-oxide-semiconductor M3 connection of plinth structure；The drain electrode of metal-oxide-semiconductor M6 and the source connection lines of metal-oxide-semiconductor M7 adjust circuit, the grid of metal-oxide-semiconductor M7
Pole and drain electrode connection DC power supply VDD；To realize the difference output of signal.
Further, connect after the linear regulating circuit is connected by 2 capacitors with the grid of metal-oxide-semiconductor M2, two capacitors it
Between by inductance be grounded, DC power supply VDD is connected between capacitor and the grid of metal-oxide-semiconductor M2；
Further, the single balance mixer foundation structure includes metal-oxide-semiconductor M2, M3 and M1, and the grid of the metal-oxide-semiconductor M1 connects
Connect the port RF, the source electrode ground connection of metal-oxide-semiconductor M1, the source electrode of drain electrode connection the metal-oxide-semiconductor M2 and M3 of metal-oxide-semiconductor M1, the leakage of metal-oxide-semiconductor M2 and M3
Pole connects DC power supply VDD and buffer, and the gate connection line of metal-oxide-semiconductor M2 adjusts circuit, and the grid of metal-oxide-semiconductor M3 connects MOS
The source electrode of pipe M6；M1 is that input radio frequency voltage signal is converted into current signal, and M2 and M3 are able to achieve the conversion of frequency, using big
Local oscillation signal be added in as switch control signal on the grid of transistor M2 and M3, pass through alternate conduction metal-oxide-semiconductor realize mixing
Function；
Further, match circuit and DC power supply are connected between the grid of the metal-oxide-semiconductor M3 and the source electrode of metal-oxide-semiconductor M6
VDD；
Further, the buffer includes voltage follower and choke-condenser filter, and the voltage follower includes 1
The grid of capacitance connection metal-oxide-semiconductor M8, and capacitor connects direct current together with the drain electrode of metal-oxide-semiconductor M8 between the grid of metal-oxide-semiconductor M8
Source VDD, capacitor are grounded together with the source electrode of metal-oxide-semiconductor M8 between the grid of metal-oxide-semiconductor M8；Voltage follower is for adjusting output resistance
Resist and conversion gain can be improved.
Further, the choke-condenser filter passes through the inductance of capacitor two of source series one of metal-oxide-semiconductor M8, reconnects
The port IF.Matching transmission is presented to frequency signal in passband, transmitting decaying is carried out to stop-band frequency SLM Signal Label Mismatch, to realize
Signal spectrum filtering function.
Further, after the match circuit is connected by 1 capacitor with 1 inductance, then with by 1 resistance and 1 capacitor
Circuit in parallel after series connection obtains good return loss for realizing port match.
Further, after the biased electrical routing power is in series with a resistor, then it is connected in parallel with a capacitor ground connection, is connected to metal-oxide-semiconductor
Grid, for guaranteeing that metal-oxide-semiconductor will not can not work because grid voltage is excessive.
Beneficial effects of the present invention:
The present invention provides a kind of active single balance mixers, have the advantages that low-voltage, low-power consumption and high-gain；At this
Match circuit and biasing circuit are used in the design of invention, realize port match convenient for adjusting port Impedance；The present invention uses one
The active balun of kind, had both realized the conversion of single-ended-to-difference, can be used for adjusting input impedance, and the frequency conversion for improving frequency mixer increases
Benefit and widen bandwidth of operation；Buffer using voltage follower as frequency mixer IF output port, convenient for adjusting output impedance
And the conversion gain of frequency mixer can be improved.
Detailed description of the invention
Fig. 1 is the connection block diagram of singly balanced active mixer；
Fig. 2 is the circuit connection diagram of singly balanced active mixer；
Fig. 3 is return loss of the RF input port in 2.4GHz；
Fig. 4 is return loss of the LO input port in 2.2GHz；
Fig. 5 is return loss of the IF output port in 0.2GHz；
Fig. 6 is intermediate frequency output spectrum of the IF output port in 0.2GHz.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, the specific embodiments are only for explaining the present invention, not
For limiting the present invention.
As shown in Figure 1, 2, a kind of active single balance mixer, the port LO input signal pass through amplifying circuit, active balun
With single balance mixer foundation structure is input to after linear regulating circuit；Amplifying circuit include match circuit, biasing circuit and
Cascode current mirror, the cascode current mirror include metal-oxide-semiconductor M4, metal-oxide-semiconductor M5 and the DC power supply port VDD, LO connection MOS
The grid of pipe M4, and match circuit, biasing circuit are connected between the port LO and the grid of metal-oxide-semiconductor M4, the source electrode of metal-oxide-semiconductor M4 connects
Ground, the source electrode of the drain electrode connection metal-oxide-semiconductor M5 of metal-oxide-semiconductor M4, the grid of metal-oxide-semiconductor M5 connect biasing circuit, the drain electrode connection of metal-oxide-semiconductor M5
DC power supply VDD and active balun；For adjusting the impedance of RF input port and improving conversion gain and widen bandwidth of operation；
Active balun includes match circuit, biasing circuit and cascode current mirror, the cascode current mirror include metal-oxide-semiconductor M6,
The grid of the drain electrode connection metal-oxide-semiconductor M6 of metal-oxide-semiconductor M7, metal-oxide-semiconductor M5, and be connected between the drain electrode of metal-oxide-semiconductor M5 and the grid of metal-oxide-semiconductor M6
Match circuit, biasing circuit, the source electrode ground connection of the metal-oxide-semiconductor M6, and connect with the metal-oxide-semiconductor M3 of single balance mixer foundation structure
It connects；The drain electrode of metal-oxide-semiconductor M6 and the source connection lines of metal-oxide-semiconductor M7 adjust circuit, the grid and drain electrode connection direct current of metal-oxide-semiconductor M7
Source VDD；To realize the difference output of signal.Linear regulating circuit is connect after being connected by 2 capacitors with the grid of metal-oxide-semiconductor M2,
It is grounded between two capacitors by inductance, DC power supply VDD is connected between capacitor and the grid of metal-oxide-semiconductor M2.
The grid that the port RF passes through the metal-oxide-semiconductor M1 of connection single balance mixer foundation structure after match circuit, biasing circuit.
In the present embodiment, single balance mixer foundation structure includes metal-oxide-semiconductor M2, M3 and M1, and the grid of metal-oxide-semiconductor M1 connects RF
Port, the source electrode ground connection of metal-oxide-semiconductor M1, the source electrode of drain electrode connection the metal-oxide-semiconductor M2 and M3 of metal-oxide-semiconductor M1, the drain electrode of metal-oxide-semiconductor M2 and M3 connect
Connect DC power supply VDD and buffer, the source electrode of the grid connection metal-oxide-semiconductor M6 of metal-oxide-semiconductor M3；The grid of metal-oxide-semiconductor M3 is with metal-oxide-semiconductor M6's
Match circuit and DC power supply VDD are connected between source electrode；M1 is that input radio frequency voltage signal is converted into current signal, M2 and
M3 is able to achieve the conversion of frequency, is added on the grid of transistor M2 and M3 using big local oscillation signal as switch control signal,
Mixing function is realized by alternate conduction metal-oxide-semiconductor.
Single balance mixer foundation structure input signal is mixed after by the new signal of generation, new signal is by buffer
Reason, buffer include voltage follower and choke-condenser filter, and the voltage follower includes 1 capacitance connection metal-oxide-semiconductor M8
Grid, and capacitor connects DC power supply VDD, capacitor and MOS between the grid of metal-oxide-semiconductor M8 together with the drain electrode of metal-oxide-semiconductor M8
It is grounded together with the source electrode of metal-oxide-semiconductor M8 between the grid of pipe M8；Voltage follower is for adjusting output impedance and can be improved
Conversion gain；Choke-condenser filter passes through the inductance of capacitor two of source series one of metal-oxide-semiconductor M8, reconnects the port IF.It is right
Matching transmission is presented in frequency signal in passband, transmitting decaying is carried out to stop-band frequency SLM Signal Label Mismatch, to realize signal spectrum
Filtering function exports signal from the port IF after buffer is handled.
Match circuit employed in the present invention is connected by 1 capacitor with 1 inductance again, then with by 1 resistance and 1 electricity
Circuit in parallel after the series connection of appearance obtains good return loss for realizing port match.Biased electrical routing power and resistance
After series connection, then it is connected in parallel with a capacitor ground connection, is connected to the grid of metal-oxide-semiconductor, for guaranteeing that metal-oxide-semiconductor will not be excessive because of grid voltage
And it can not work.
It is designed with source single balance mixer for the present invention, design of Simulation is carried out using ADS, as shown in figure 3, according to
The parameters simulation figure of the return loss S11 of the port RF acquired by the design method, in 2.4GHz or so satisfaction -10dBm hereinafter,
Good matching index is reached.As shown in figure 4, the ginseng of the return loss S22 according to the port LO acquired by the design method
Number analogous diagram, in 2.2GHz or so satisfaction -10dBm hereinafter, having reached good matching index.As shown in figure 5, according to the design
The parameters simulation figure of the return loss S33 of the port IF acquired by method, in 0.2GHz or so satisfaction -6dBm hereinafter, reaching
Good matching index.As shown in fig. 6, according to intermediate frequency output spectrum analogous diagram acquired by the design method, in 0.2GHz
Intermediate frequency output spectrum is -3.45dBm, has reached good index.
Above embodiments are merely to illustrate design philosophy and feature of the invention, and its object is to make technology in the art
Personnel can understand the content of the present invention and implement it accordingly, and protection scope of the present invention is not limited to the above embodiments.So it is all according to
It is within the scope of the present invention according to equivalent variations made by disclosed principle, mentality of designing or modification.
Claims (9)
1. a kind of active single balance mixer, which is characterized in that the port LO input signal passes through amplifying circuit, active balun and line
Property adjust circuit after be input to single balance mixer foundation structure；The port RF input signal is after match circuit, biasing circuit
Single balance mixer foundation structure is connected, the single balance mixer foundation structure includes metal-oxide-semiconductor M2, M3 and M1, the metal-oxide-semiconductor
The grid of M1 connects the port RF, the source electrode ground connection of metal-oxide-semiconductor M1, the source electrode of drain electrode connection the metal-oxide-semiconductor M2 and M3 of metal-oxide-semiconductor M1, metal-oxide-semiconductor
The drain electrode connection DC power supply VDD and buffer of M2 and M3, the gate connection line of metal-oxide-semiconductor M2 adjust circuit, the grid of metal-oxide-semiconductor M3
The source electrode of pole connection metal-oxide-semiconductor M6；M1 is that input radio frequency voltage signal is converted into current signal, and M2 and M3 are able to achieve turning for frequency
It changes；The single balance mixer foundation structure input signal is mixed after by the new signal of generation, new signal is by buffer
It is exported after reason from the port IF.
2. a kind of active single balance mixer according to claim 1, which is characterized in that the amplifying circuit includes matching
Circuit, biasing circuit and cascode current mirror, the cascode current mirror include metal-oxide-semiconductor M4, metal-oxide-semiconductor M5 and DC power supply
The port VDD, LO connects the grid of metal-oxide-semiconductor M4, and match circuit, biasing circuit are connected between the port LO and the grid of metal-oxide-semiconductor M4,
The source electrode of metal-oxide-semiconductor M4 is grounded, and the source electrode of the drain electrode connection metal-oxide-semiconductor M5 of metal-oxide-semiconductor M4, the grid of metal-oxide-semiconductor M5 connects biasing circuit,
The drain electrode connection DC power supply VDD of metal-oxide-semiconductor M5 and active balun.
3. a kind of active single balance mixer according to claim 1, which is characterized in that the active balun includes matching
Circuit, biasing circuit and cascode current mirror, the cascode current mirror include metal-oxide-semiconductor M6, metal-oxide-semiconductor M7, metal-oxide-semiconductor M5's
The grid of drain electrode connection metal-oxide-semiconductor M6, and match circuit, biased electrical are connected between the drain electrode of metal-oxide-semiconductor M5 and the grid of metal-oxide-semiconductor M6
Road, the source electrode ground connection of the metal-oxide-semiconductor M6, and connect with the metal-oxide-semiconductor M3 of single balance mixer foundation structure；The drain electrode of metal-oxide-semiconductor M6
Circuit, the grid and drain electrode connection DC power supply VDD of metal-oxide-semiconductor M7 are adjusted with the source connection lines of metal-oxide-semiconductor M7.
4. a kind of active single balance mixer according to claim 1 or 2, which is characterized in that the linear regulating circuit
It connect, is grounded between two capacitors by inductance, the grid of capacitor and metal-oxide-semiconductor M2 with the grid of metal-oxide-semiconductor M2 after being connected by 2 capacitors
DC power supply VDD is connected between pole.
5. a kind of active single balance mixer according to claim 1, which is characterized in that the grid of the metal-oxide-semiconductor M3 with
Match circuit and DC power supply VDD are connected between the source electrode of metal-oxide-semiconductor M6.
6. a kind of active single balance mixer according to claim 1, which is characterized in that the buffer include voltage with
With device and choke-condenser filter, the voltage follower includes the grid of 1 capacitance connection metal-oxide-semiconductor M8, and capacitor and metal-oxide-semiconductor
DC power supply VDD is connected between the grid of M8 together with the drain electrode of metal-oxide-semiconductor M8, between capacitor and the grid of metal-oxide-semiconductor M8 with metal-oxide-semiconductor
The source electrode of M8 is grounded together.
7. a kind of active single balance mixer according to claim 6, which is characterized in that the choke-condenser filter is logical
The inductance of capacitor two of source series one of metal-oxide-semiconductor M8 is crossed, the port IF is reconnected, matching is presented to frequency signal in passband and is passed
It is defeated, transmitting decaying is carried out to stop-band frequency SLM Signal Label Mismatch.
8. a kind of according to claim 1, active single balance mixer described in 2,3 or 5, which is characterized in that the match circuit
After being connected by 1 capacitor with 1 inductance, then with by the circuit in parallel after the connecting of 1 resistance and 1 capacitor, for realizing end
Mouth matching.
9. a kind of according to claim 1, active single balance mixer described in 2,3 or 5, which is characterized in that the biasing circuit
By power supply it is in series with a resistor after, then be connected in parallel with a capacitor ground connection, the biasing circuit is connected to the grid of metal-oxide-semiconductor.
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| CN201811123486.2A CN109450380A (en) | 2018-09-26 | 2018-09-26 | A kind of active single balance mixer |
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| CN201811123486.2A CN109450380A (en) | 2018-09-26 | 2018-09-26 | A kind of active single balance mixer |
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