CN100553115C

CN100553115C - Active mixer with self-adjusting bias feedback and linear bias circuit

Info

Publication number: CN100553115C
Application number: CNB2005100082021A
Authority: CN
Inventors: 吴经国; 陈志纬; 张云山; 王是琦
Original assignee: Richwave Technology Corp
Current assignee: Richwave Technology Corp
Priority date: 2005-02-07
Filing date: 2005-02-07
Publication date: 2009-10-21
Anticipated expiration: 2025-02-07
Also published as: CN1819448A

Abstract

The invention provides an active mixer with self-adjusting bias feedback, wherein a dual-self-feedback bias architecture is further applied, the active mixer with self-adjusting bias feedback comprises: a supply voltage, a RF input matching/driving unit, a local oscillation input matching/driving unit, a mixing core unit, a self-adjusting dual-bias circuit and an intermediate frequency output matching/buffering unit. The object of the invention is to improve the linearity of the known mixer without affecting other characteristics, and to reduce the number of components and the area required. Moreover, the temperature response can be improved, the yield can be improved, the unit cost can be reduced, and the design of the dual-autonomous feedback bias architecture can be further applied to other semiconductor manufacturing processes, elements and other microwave products.

Description

The active mixer of tool self-adjustable bias feedback and linear biasing circuit

Technical field

The invention provides a kind of active mixer of tool self-adjustable bias feedback, refer to a kind of design and notion especially with two autonomous feedback bias voltage frameworks.

Background technology

In communication system miscellaneous, frequency mixer (Mixer) is all an important and indispensable element.And the quality and the usefulness of the linearity of frequency mixer itself (Linearity), conversion gain (Conversion Gain), noise ratio (Signal-to-Noise Rate), temperature response properties influence communication systems such as (Temperature Response).Generally speaking can provide one to be biased into frequency mixer, but traditional bias circuit when increasing, input signal can make very poor that the linearity characteristic of frequency mixer becomes.So be modified to the linearity that single feedback bias circuit slightly promotes frequency mixer, but that linearity characteristic can't satisfy still is required.

Many various methods of improving the mixer linearity degree are arranged recently, as U.S. Pat 6,205, No. 325 (seeing also Fig. 1), 6,472, No. 925 (seeing also Fig. 2), 6,639, No. 446 and 6,639, No. 447 etc.

Yet these methods contain complicated (numeral) control circuit framework, and the grid bias power supply of the many groups of the needs that have though promoted the linearity of frequency mixer, causes the reduction of conversion gain, increase of noise ratio or the like.What is more, with destroying the primary characteristic of frequency mixer or the consumption of increase electric current, makes the operational effectiveness of communication system integral body be subjected to great influence.

Thus, the improving of the above-mentioned defective of inventor's thoughts is that the spy concentrates on studies and cooperates the utilization of scientific principle, proposes a kind of reasonable in design and effectively improve the invention of above-mentioned defective finally.

Summary of the invention

In view of this, purposes of the present invention for the linearity that solves known mixer not good with frequency mixer in problems such as inconvenience in the bias circuit design and defective.In order to reach above-mentioned purpose, the invention provides a kind of active mixer of self-adjustable bias feedback, this active mixer comprises: the voltage that provides this active mixer required is provided a service voltage; One radio frequency input coupling/driver element receives a radio frequency input signal, and this radio frequency input signal is carried out signal coupling/driving handle; One local oscillations input coupling/driver element receives a local oscillations input signal, and this local oscillations input signal is carried out signal coupling/driving handle; One mixing core cell receives the output signal that coupling/driver element is imported in this radio frequency input coupling/driver element and this local oscillations, and this mixing core cell is used to carry out the computing of signal mixing; One from the two bias circuit unit of tonality, this service voltage provides voltage to being somebody's turn to do from the two bias circuit unit of tonality, should then export this mixing core cell that is biased into of a stable and tool compensation effect from the two bias circuit unit of tonality, should be formed by two linear biasing circuit Bing connection institutes from the two bias circuit unit of tonality; And intermediate frequency output coupling/buffer cell, receive the signal that this mixing core cell is exported, after this intermediate frequency output coupling/buffer cell carries out signal coupling/buffered, export an intermediate frequency signal; Wherein, this service voltage provides this radio frequency input coupling/driver element, this local oscillations input coupling/driver element, this mixing core cell, should export the required voltage of coupling/buffer cell from the two bias circuit unit of tonality and this intermediate frequency, provide under the required voltage from the two bias circuit unit of tonality at this service voltage and this, this active mixer carries out the mixing computing of this radio frequency input signal and this local oscillations input signal, exports this intermediate frequency signal at last.

This radio frequency input coupling/driver element receives a radio frequency input signal, this local oscillations input coupling/driver element receives a local oscillations input signal, this mixing core cell receives the output signal of this radio frequency input coupling/driver element and this local oscillations input coupling/driver element then, carries out the computing of signal mixing.Should then export this mixing core cell that is biased into of a stable and tool compensation effect from the two bias circuit unit of tonality.So this intermediate frequency output coupling/buffer cell is promptly exported an intermediate frequency signal after receiving the signal that this mixing core cell exported and carrying out signal coupling/buffered.The active mixer of this self-adjustable bias feedback more can increase by a band gap reference circuit (Bandgap Reference Circuit), this service voltage provides voltage to be with gap reference circuit to this, and this band gap reference circuit more exports a burning voltage or stabling current extremely should be from the two bias circuit unit of tonality.

Should form by two linear biasing circuits institute in parallel from the two bias circuit unit of tonality.And this linear biasing circuit can be made of a plurality of transistors or a plurality of passive device.

For reaching above-mentioned purpose, the present invention also provides a kind of linear biasing circuit, comprising: a direct current voltage source provides direct voltage; One direct current current source provides direct current; One first NPN transistor, its collector terminal are electrically connected to this direct voltage source anode, and its base terminal electrically connects this DC current source anode; One second NPN transistor, its collector electrode electrically connect this DC current source anode; One first passive device, one end electrically connect this second NPN transistor collector terminal, and the other end then electrically connects this second NPN transistor emitter-base bandgap grading end; And one second passive device, the 3rd passive device, the common electrically connect of one end of the 4th passive device and the 5th passive device, and this second passive device other end electrically connects this first NPN transistor emitter-base bandgap grading end, the 3rd passive device other end electrically connects this second NPN transistor base terminal, the 4th passive device other end electrically connects this second NPN transistor emitter-base bandgap grading end, the 5th passive device other end then is electrically connected to a voltage output end, after this direct voltage source and this DC current source provide voltage and electric current, export a linear bias by this voltage output end.

For reaching above-mentioned purpose, the present invention provides a kind of linear biasing circuit in addition, comprising: a direct current voltage source provides direct voltage; One direct current current source provides direct current; One first NPN transistor, its collector terminal are electrically connected to this direct voltage source anode, and its base terminal is electrically connected to this DC current source anode; One second NPN transistor, its collector terminal electrically connect this DC current source anode, and its base terminal electrically connects this first NPN transistor emitter-base bandgap grading end; One first passive device, one end electrically connect this first NPN transistor emitter-base bandgap grading end, the electrical ground connection of the other end; One second passive device, one end electrically connect this second NPN transistor emitter-base bandgap grading end, the electrical ground connection of the other end; And one the 3rd NPN transistor, its collector terminal, base terminal and this DC current source anode are electrically connected each other, its emitter-base bandgap grading end then is electrically connected to a voltage output end, after this direct voltage source and this DC current source provide voltage and electric current, exports a linear bias by this voltage output end.

For reaching above-mentioned purpose, the present invention provides a kind of linear biasing circuit again, comprising: a direct current voltage source provides direct voltage; One first passive device, one end electrically connect this direct voltage source anode; One second passive device, the one end electrically connects the other end of this first passive device; And one the 3rd passive device, the one end electrically connects the other end of this second passive device, and the 3rd passive device other end then is electrically connected to a voltage output end, after this direct voltage source provides voltage, exports a linear bias by this voltage output end.

The active mixer of self-adjustable bias feedback of the present invention, except the linearity of improving known mixer and do not influence other characteristic, number of elements and area required for the present invention are less.What is more, can improve temperature response, improves yield, reduce unit cost, and the design of two autonomous feedback bias voltage frameworks more can be applied to other manufacture of semiconductor, element and other microwave product simultaneously.

In order further to understand feature of the present invention and technology contents, see also detailed description of the present invention and accompanying drawing, yet shown in accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.

Description of drawings

Fig. 1 is the circuit diagram of known negative feedback linearisation frequency mixer;

Fig. 2 is the circuit diagram of known degeneration formula linearisation frequency mixer;

Fig. 3 is the function block schematic diagram of the active mixer of tool self-adjustable bias feedback of the present invention;

Fig. 4 implements aspect for first of linear biasing circuit of the present invention;

Fig. 5 implements aspect for second of linear biasing circuit of the present invention;

Fig. 6 implements aspect for the 3rd of linear biasing circuit of the present invention;

Fig. 7 is first embodiment of active mixer of the present invention, is the circuit diagram of single balanced type frequency mixer of tool bilinearity feedback bias circuit; And

Fig. 8 is another embodiment of active mixer of the present invention, is the circuit diagram of the double-balance frequency mixer of tool bilinearity feedback bias circuit.

Symbol description among the figure:

Fig. 3:

Service voltage 31 is from the two bias circuit unit 32 of tonality

Mixing core cell 33 radio frequency input signal RF _In

Vibration input signal LO _InIntermediate frequency output signal IF _Out

Local oscillations input coupling/driver element 34

Radio frequency input coupling/driver element 35

Intermediate frequency output coupling/buffer cell 36

Band gap reference circuit unit 37 frequency mixers 30 of the present invention

Fig. 4:

Direct voltage source V ₄DC current source I _S4

The first NPN transistor Q ₄₁The second NPN transistor Q ₄₂

The first passive device P _C41The second passive device P _C42

The 3rd passive device P _C43The 4th passive device P _C44

The 5th passive device P _C45Voltage output end V _O4

Linear bias first is implemented aspect 40

Fig. 5:

Direct voltage source V ₅DC current source I _S5

The first NPN transistor Q ₅₁The second NPN transistor Q ₅₂

The 3rd NPN transistor Q ₅₃The first passive device P _C51

The second passive device P _C52Voltage output end V _O5

Linear bias second is implemented aspect 50

Fig. 6:

Direct voltage source V ₆The first passive device P _C61

The second passive device P _C62The 3rd passive device P _C63

Voltage output end V _O6

Linear bias the 3rd is implemented aspect 60

Fig. 7:

Direct voltage source V ₇The first bias circuit V _Bais71

The second bias circuit V _Bais72The first NPN transistor Q ₇₁

The second NPN transistor Q ₇₂The 3rd NPN transistor Q ₇₃

The first passive device P _C71The second passive device P _C72

The 3rd passive device P _C73The 4th passive device P _C74

Radio frequency input signal RF _InVibration input signal LO _In

Intermediate frequency output signal IF _Out

Single balanced type frequency mixer 70 of the present invention

Fig. 8:

Direct voltage source V ₈The first bias circuit V _Bais81

The second bias circuit V _Bais82The first NPN transistor Q ₈₁

The second NPN transistor Q ₈₂The 3rd NPN transistor Q ₈₃

The 4th NPN transistor Q ₈₄The 5th NPN transistor Q ₈₅

The 6th NPN transistor Q ₈₆The first passive device P _C81

The second passive device P _C82The 3rd passive device P _C83

The 4th passive device P _C84The 5th passive device P _C85

The 6th passive device P _C86The 7th passive device P _C87

The 8th passive device P _C88Radio frequency input signal RF _In

Vibration input signal LO _InIntermediate frequency output signal IF _Out

Double-balance frequency mixer 80 of the present invention

Embodiment

See also Fig. 3, Fig. 3 is the function block schematic diagram of the active mixer of tool self-adjustable bias feedback of the present invention.Frequency mixer 30 of the present invention and known maximum difference improvement part promptly are to use a kind of design of two autonomous feedback bias voltage frameworks and notion that bias circuit stable and compensation effect is provided.And provide appropriate bias current to active circuits, to avoid or to reduce the signal distortion.Operation principle of the present invention and technical characterictic below are described in detail in detail.

Please cooperate Fig. 3, a service voltage 31 provides radio frequency input coupling/driver element 35, local oscillations input coupling/driver element 34, a mixing core cell 33, one to export the required voltage of coupling/buffer cell 36 from tonality pair bias circuit unit 32 and an intermediate frequency.Radio frequency input coupling/driver element 35 receives a radio frequency input signal RF _InAfter, to radio frequency input signal RF _InCarry out signal coupling/driving, local oscillations input coupling/driver element 34 then receives a local oscillations input signal LO _InAfter, to local oscillations input signal LO _InCarry out signal coupling/driving.And behind the signal that mixing core cell 33 received RFs input coupling/driver element 35 and local oscillations input coupling/driver element 34 are exported, carry out the computing of signal mixing.

Then from the two bias circuit unit of tonality the stable and tool compensation effect of 32 outputs one be biased into mixing core cell 33.So the signal that intermediate frequency output coupling/buffer cell 36 reception mixing core cells 33 are exported and carry out signal coupling/buffered after, promptly export an intermediate frequency output signal IF _OUTWherein, form by two linear biasing circuits institute in parallel from the two bias circuit unit 32 of tonality.Frequency mixer 30 of the present invention more can increase by a band gap reference circuit 37 (BandgapReference Circuit), service voltage 31 provides voltage to being with gap reference circuit 37, and band gap reference circuit 37 output one burning voltages or electric current are extremely from the two bias circuit unit 32 of tonality.Below will introduce the enforcement aspect of the linearisation bias voltage in the two bias circuit unit 32 of tonality.

See also Fig. 4, Fig. 4 implements aspect for first of linear biasing circuit of the present invention, and linear biasing circuit 40 of the present invention comprises: a direct current voltage source V ₄, a direct current current source I _S4, one first NPN transistor Q ₄₁, one second NPN transistor Q ₄₂, one first passive device P _C41, one second passive device P _C42, one the 3rd passive device P _C43, one the 4th passive device P _C44, and one the 5th passive device P _C45

Direct voltage source V ₄Provide direct voltage, DC current source I _S4Direct current is provided.The first NPN transistor Q at first ₄₁, its collector terminal is electrically connected to direct voltage source V ₄Anode, its base terminal electrically connects DC current source I _S4Anode.The second NPN transistor Q then ₄₂, its collector electrode electrically connects DC current source I _S4Anode.Follow the first passive device P _C41, the one end electrically connects the second NPN transistor Q ₄₂Collector terminal, the other end then electrically connect the second NPN transistor Q ₄₂The emitter-base bandgap grading end.And then the second passive device P _C42, the 3rd passive device P _C43, the 4th passive device P _C44, the 5th passive device P _C45The common electrically connect of an end, and the second passive device P _C42The other end electrically connects the first NPN transistor Q ₄₁The emitter-base bandgap grading end, the 3rd passive device P _C43The other end electrically connects the second NPN transistor Q ₄₂Base terminal, the 4th passive device P _C44The other end electrically connects the second NPN transistor Q ₄₂The emitter-base bandgap grading end, the 5th passive device P _C45The other end then is electrically connected to a voltage output end V ₀₄Last direct voltage source V ₄With DC current source I _S4After voltage and electric current are provided, through the dividing potential drop of each element, by this voltage output end V ₀₄Export a linear bias.

Please cooperate Fig. 4, wherein each NPN transistor in the linear biasing circuit 40 can PNP, NMOS or the close element of effect such as PMOS transistor replace.Each passive device in the linear biasing circuit 40 also can be appropriate size, kind, ratio or form transistor, diode, resistance, inductive impedance or capacitive impedance then.

See also Fig. 5, Fig. 5 implements aspect for second of linear biasing circuit of the present invention, and linear biasing circuit 50 of the present invention comprises: a direct current voltage source V ₅, a direct current current source I _S5, one first NPN transistor Q ₅₁, one second NPN transistor Q ₅₂, one the 3rd NPN transistor Q ₅₃, one first passive device P _C51, and one second passive device P _C52

Direct voltage source V ₅Provide direct voltage, DC current source I _S5Direct current is provided.The first NPN transistor Q at first ₅₁, its collector terminal is electrically connected to direct voltage source V ₅Anode, its base terminal is electrically connected to DC current source I _S5Anode.The second NPN transistor Q then ₅₂, its collector terminal electrically connects DC current source I _S5Anode, its base terminal electrically connect the first NPN transistor Q ₅₁The emitter-base bandgap grading end.Follow the first passive device P _C51, the one end electrically connects the first NPN transistor Q ₅₁The emitter-base bandgap grading end, the electrical ground connection of the other end.And then the second passive device P _C52, the one end electrically connects the second NPN transistor Q ₅₂The emitter-base bandgap grading end, the electrical ground connection of the other end.Also has the 3rd NPN transistor Q ₅₃, its collector terminal, base terminal and DC current source I _S5Anode is electrically connected each other, the 3rd NPN transistor Q ₅₃The emitter-base bandgap grading end then is electrically connected to a voltage output end V ₀₅Last direct voltage source V ₅With DC current source I _S5After voltage and electric current are provided, through the dividing potential drop of each element, by this voltage output end V ₀₅Export a linear bias.

Please cooperate Fig. 5, wherein each NPN transistor in the linear biasing circuit 50 can PNP, NMOS or the close element of effect such as PMOS transistor replace.Each passive device in the linear biasing circuit 50 also can be appropriate size, kind, ratio or form transistor, diode, resistance, inductive impedance or capacitive impedance then.

See also Fig. 6, Fig. 6 implements aspect for the 3rd of linear biasing circuit of the present invention, and linear biasing circuit 60 of the present invention comprises: a direct current voltage source V ₆, one first passive device P _C61, one second passive device P _C62And one the 3rd passive device P _C63

Direct voltage source V ₆Direct voltage is provided.The first passive device P at first _C61, the one end electrically connects direct voltage source V ₆Anode.The second passive device P then _C62, the one end electrically connects the first passive device P _C61The other end.Follow the 3rd passive device P _C63, the one end electrically connects the second passive device P _C62The other end, the 3rd passive device P _C63The other end then is electrically connected to a voltage output end.Last direct voltage source V ₆After voltage is provided, through the dividing potential drop of each element, by this voltage output end V ₀₆Export a linear bias.

Please cooperate Fig. 6, wherein each passive device in the linear biasing circuit 60 also can be appropriate size, kind, ratio or form transistor, diode, resistance, inductive impedance or capacitive impedance.

See also Fig. 3 and please cooperate Fig. 3, Fig. 4 and Fig. 5.The pattern of frequency mixer can be the frequency mixer of any pattern.Wherein from the two bias circuit unit 32 of tonality, both are formed in parallel by linear biasing circuit 40 and linear biasing circuit 50.Perhaps, from the two bias circuit unit 32 of tonality, both are formed in parallel by linear biasing circuit 40 and linear biasing circuit 60.Again or, from the two bias circuit unit 32 of tonality, both are formed in parallel by linear biasing circuit 50 and linear biasing circuit 60.

Below will introduce the embodiment of the active mixer of tool self-adjustable bias feedback of the present invention.See also Fig. 7 and please cooperate Fig. 3, Fig. 4, Fig. 5 and Fig. 6, Fig. 7 is single balanced type mixer schematic diagram of tool bilinearity feedback bias circuit for first embodiment of active mixer of the present invention.In the utilization of the two bias circuit unit 32 of tonality, the first bias circuit V arranges in pairs or groups _Bais71With the second bias circuit V _Bais72And the first bias circuit V _Bais71With the second bias circuit V _Bais72Both are formed in parallel for linear biasing circuit 40 and linear biasing circuit 50; Or by linear biasing circuit 40 and linear biasing circuit 60 both are formed in parallel; Again or, both are formed in parallel by linear biasing circuit 50 and linear biasing circuit 60.

The present invention can use the frequency mixer of various ways.See also Fig. 8 and please cooperate Fig. 3, Fig. 4, Fig. 5 and Fig. 6, Fig. 8 is the double-balance mixer schematic diagram of tool bilinearity feedback bias circuit for another embodiment of active mixer of the present invention.In the utilization of the two bias circuit unit 32 of tonality, the first bias circuit V arranges in pairs or groups _Bais81With the second bias circuit V _Bais82And the first bias circuit V _Bais81With the second bias circuit V _Bais82Also both are formed in parallel for linear biasing circuit 40 and linear biasing circuit 50; Or by linear biasing circuit 40 and linear biasing circuit 60 both are formed in parallel; Again or, both are formed in parallel by linear biasing circuit 50 and linear biasing circuit 60.

The present invention is with the active mixer of self-adjustable bias feedback, except temperature-compensating be provided, improve the linearity, improve usefulness, circuit framework is simple and easy, required element is less, the high whole degree of circuit and area less, still the electric current that do not increase consumption does not destroy the frequency mixer primary characteristic simultaneously.Wherein two autonomous feedback bias voltage frameworks more can use to various manufacture of semiconductor, element and other microwave product, as low noise amplifier, oscillator or power amplifier or the like.In sum, the present invention is a rare contrive equipment in fact, has usability on the industry, novelty and progressive, meets the application for a patent for invention important document fully, files an application according to Patent Law.

The above, it only is the detailed description of preferable possible embodiments of the present invention and graphic, non-so promptly limit to claim of the present invention, so equivalent alternate embodiment of using specification of the present invention and accompanying drawing content to do such as, all in like manner all be contained in range content of the present invention, anyly be familiar with this skill person in the field of the invention, can think easily and variation or modify the claim that all can be encompassed in this case.

Claims

1. An active mixer with self-tuning bias feedback, characterized in that the active mixer comprises:

A supply voltage for providing the voltage required by the active mixer;

A radio frequency input matching/driving unit, which receives a radio frequency input signal and performs signal matching/driving processing on the radio frequency input signal;

A local oscillation input matching/driving unit, which receives a local oscillation input signal and performs signal matching/driving processing on the local oscillation input signal;

A frequency mixing core unit, receiving the output signals of the radio frequency input matching/driving unit and the local oscillation input matching/driving unit, the frequency mixing core unit is used for signal mixing operation;

A self-regulating dual-bias circuit unit, the supply voltage provides a voltage to the self-regulating dual-bias circuit unit, and the self-regulating dual-bias circuit unit outputs a stable and compensating bias voltage to the hybrid A frequency core unit, the self-regulating dual bias circuit unit is composed of two linearized bias circuits connected in parallel; and

An intermediate frequency output matching/buffering unit receives the signal output by the mixing core unit, and the intermediate frequency output matching/buffering unit outputs an intermediate frequency signal after signal matching/buffering processing;

Wherein, the supply voltage provides the voltage required by the radio frequency input matching/driving unit, the local oscillation input matching/driving unit, the frequency mixing core unit, the self-regulating dual bias circuit unit and the intermediate frequency output matching/buffering unit Under the condition that the supply voltage and the self-regulating double bias circuit unit provide the required voltage, the active mixer performs the frequency mixing operation of the radio frequency input signal and the local oscillation input signal, and finally outputs the intermediate frequency signal.

2. The active mixer with self-tuning bias feedback as claimed in claim 1, wherein a band difference reference circuit is further added, the supply voltage provides a voltage to the band difference reference circuit, and the band difference reference The circuit outputs a stable voltage or a stable current to the self-regulating dual-bias circuit unit.

3. The active mixer with self-adjusting bias feedback as claimed in claim 1, wherein the self-adjusting dual bias circuit unit, wherein a linearization bias circuit comprises:

a DC voltage source providing a DC voltage;

a DC current source providing DC current;

A first NPN transistor, its collector terminal is electrically connected to the positive terminal of the DC voltage source, and its base terminal is electrically connected to the positive terminal of the DC current source;

a second NPN transistor, the collector of which is electrically connected to the positive terminal of the DC current source;

a first passive element, one end of which is electrically connected to the collector end of the second NPN transistor, and the other end is electrically connected to the emitter end of the second NPN transistor; and

One end of the second passive element, the third passive element, the fourth passive element and the fifth passive element are electrically connected together, and the other end of the second passive element is electrically connected to the emitter of the first NPN transistor, and the third passive element The other end of the element is electrically connected to the base end of the second NPN transistor, the other end of the fourth passive element is electrically connected to the emitter end of the second NPN transistor, and the other end of the fifth passive element is electrically connected to a voltage output end;

After the DC voltage source and the DC current source provide voltage and current, a linear bias voltage is output from the voltage output terminal.

4. The active mixer with self-adjusting bias feedback as claimed in claim 1, wherein the self-adjusting dual-bias circuit unit, wherein a linearization bias circuit comprises:

a DC voltage source providing a DC voltage;

a DC current source providing DC current;

A second NPN transistor, the collector terminal of which is electrically connected to the positive terminal of the DC current source, and the base terminal of which is electrically connected to the emitter terminal of the first NPN transistor;

A first passive element, one end of which is electrically connected to the emitter end of the first NPN transistor, and the other end is electrically grounded;

A second passive element, one end of which is electrically connected to the emitter of the second NPN transistor, and the other end is electrically grounded; and

A third NPN transistor, its collector terminal, base terminal and the positive terminal of the DC current source are electrically connected to each other, and its emitter terminal is electrically connected to a voltage output terminal, the DC voltage source and the DC current source provide voltage After being connected with the current, a linear bias voltage is output from the voltage output terminal.

5. The active mixer with self-adjusting bias feedback as claimed in claim 1, wherein the self-adjusting dual bias circuit unit, one of the linearization bias circuits comprises:

a DC voltage source providing a DC voltage;

a first passive element, one end of which is electrically connected to the positive end of the DC voltage source;

a second passive element, one end of which is electrically connected to the other end of the first passive element; and

A third passive element, one end of which is electrically connected to the other end of the second passive element, and the other end of the third passive element is electrically connected to a voltage output end. After the DC voltage source provides voltage, the voltage output end Output a linear bias voltage.

6. The active mixer with self-adjustable bias feedback as claimed in claim 3, 4 or 5, wherein each passive element in the linear bias circuit is a transistor, a diode, a resistor, an inductance impedance or capacitive impedance.

7. A linearization bias circuit, characterized in that it comprises:

a DC voltage source providing a DC voltage;

a DC current source providing DC current;

One end of the second passive element, the third passive element, the fourth passive element and the fifth passive element are electrically connected together, and the other end of the second passive element is electrically connected to the emitter of the first NPN transistor, and the third passive element The other end of the element is electrically connected to the base end of the second NPN transistor, the other end of the fourth passive element is electrically connected to the emitter end of the second NPN transistor, and the other end of the fifth passive element is electrically connected to a voltage output end. After the DC voltage source and the DC current source provide voltage and current, a linear bias voltage is output from the voltage output terminal.

8. A linearization bias circuit, characterized in that it comprises:

a DC voltage source providing a DC voltage;

a DC current source providing DC current;

9. A linearization bias circuit, characterized in that it comprises:

a DC voltage source providing a DC voltage;

10. The linear bias circuit according to claim 7, 8 or 9, wherein each passive element in the linear bias circuit is a transistor, a diode, a resistor, an inductive impedance or a capacitive impedance.