CN108563274A - A kind of continuously adjustable linearin-dB variable gain circuit structure - Google Patents
A kind of continuously adjustable linearin-dB variable gain circuit structure Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
The invention discloses a kind of continuously adjustable linearin-dB variable gain circuit structures, including：Amplifier core circuit, common mode output bias circuit, index proportion current generating circuit, index proportion current biasing circuit；Continuously adjustable accurate linearin-dB variable gain enlarged structure proposed by the present invention, pass through three groups of negative feedback structures, the ingenious System design of two groups of biasing replicated architectures and a current distributing structure differential pair, in the differential amplification pair of transistors of a structure of current rudder, ensure total current it is constant i.e. output common mode voltage it is constant in the case of, it is simple and effective and accurate realize a transistor channel electric current exponentially changed as additional control voltage line changes, the electric current determines that the mutual conductance of the transistor changes also with control voltage line and exponentially changes, and then realize a continuously adjustable variable gain amplifier structure for meeting linearin-dB gain control.
Description
Technical field
The present invention relates to gain amplifier, more particularly to a kind of novel continuously adjustable linearin-dB variable gain circuit knot
Structure.
Background technology
Variable-gain amplification circuit is widely used in communication circuitry, such as automatic growth control etc., is to improve
The dynamic range of system.Usually this gain control requires circuit gain index variation with the variation of Linear Control voltage, i.e.,
Linearin-dB (dB-Linear) changes.That is, control voltage is linear, and gain is that (index becomes linearin-dB
Change).Realizing this function has a two major classes method, one kind be based on discrete programmable substep digital auto-gain compensative mechanism, it is another
Class is the continuously adjustable gain control mechanism of pure simulation.In many applications, it is desirable that using the continuously adjustable decibel line of pure simulation
Property control to avoid the burr phenomena appeared in digital auto-gain compensative.
The continuously adjustable linearin-dB Continual Gain Actuator circuit of pure simulation mainly has following a few class implementation methods, the first is to adopt
With pseudoindex (pseudo-exponential) controling circuit structure approached based on Taylor series, the shortcomings that a kind of this structure
Exponential relationship precision between gain and voltage is not high；Second is accurate linearin-dB control circuit, typically with
Triode is core, and by a series of conversion circuits to obtain accurate linearin-dB gain control planning on a large scale, this is a kind of
Circuit has a wide range of application, but its difficult point is the design of accurate linearin-dB gain control circuit on a large scale, usual such electricity
The linearin-dB control structure on road is extremely complex.
Invention content
The present invention proposes to be continuously adjusted linearin-dB control circuit thus, by propose a kind of novel Exponential current generate and
Replicated architecture, to achieve the purpose that simplified circuit structure.
The object of the invention：It is to provide a kind of novel continuously adjustable linearin-dB variable gain circuit structure, circuit
It is simple in structure, and the amplifying circuit realized also has the advantages that the constant common-mode output voltage that can be controlled.
To achieve the above object, of the invention to adopt the following technical scheme that：
A kind of continuously adjustable linearin-dB variable gain circuit structure, including：Amplifier core circuit, common mode output biasing
Circuit, index proportion current generating circuit, index proportion current biasing circuit；
The amplifier core circuit is differential pair structure of current rudder, includes the differential pair M of field-effect tube M1, M2 composition1/
M2, field-effect tube M3, M4 composition differential pair M3/M4, a pair of of differential load resistance R1/R2And tail current biases transistor
M13, input differential signal VIN+/VIN-, it is separately connected differential pair M1/M2Grid, output difference signal be VOUT+/VOUT,
VOUT+Connect M2/M4Drain electrode, VOUT-Connect M1/M3Drain electrode, differential pair M1/M2Drain electrode pass through resistance R respectively1/R2Connection is high
Level VDD, two couples of differential pair M1/M2、M3/M4Source electrode be connected respectively to transistor M13Drain electrode, M13Source electrode ground connection；
The common mode output bias circuit generates voltage VB1Load is in M13Grid；
The index proportion current generating circuit and index proportion current biasing circuit are sequentially connected, and are generated voltage VB2 and are added
It is loaded in M3/M4Grid；Pass through voltage VB1With voltage VB2Synergy so that tail current transistor M13In bias current be I0
It is constant controllable, while flowing through M1Channel current I1With I0It has exponent relation, to make gain change in linearin-dB.
Preferably, the common mode output bias circuit includes the differential pair M of field-effect tube M5, M6 composition5/M6, field-effect
The differential pair M of pipe M7, M8 composition7/M8, a pair of of differential load resistance R3/R4And tail current biasing transistor M14；Differential pair
M5/M6Grid meets external common-mode voltage VCM, M7/M8The voltage added on grid comes from produced by index proportion current biasing circuit
Bias voltage VB2, differential load resistance R3/R4Output end be shorted together and be connected to the positive input of operational amplifier OP1
End, the negative input termination common mode reference voltage V of OP1CM, the output end voltage VB1 of OP1 meets M14Grid, formed negative-feedback return
Road.
Preferably, the negative feedback loop that the common mode output bias circuit is formed with amplifier core circuit, forces common mode
Load resistance R in output bias circuit3/R4Output end voltage VX1Equal to VCM, then VDD-1/2*I0* R=VCM, I0Thus public
Formula decision, i.e. I0=2* (VDD-VCM)/R。
Preferably, the index proportion current generating circuit includes triode Q1、Q2The differential configuration triode Q of composition1/
Q2, a pair of of differential resistor R5/R6, tail current transistor M16And operational amplifier OP2；The positive input of operational amplifier OP2 terminates Q2
The output end V of branch circuit load resistance RX3, the M of the output termination of negative input termination additional common-mode voltage VCM, OP216Grid and M16
And Q2Form negative feedback loop.
Preferably, the index proportion current biasing circuit includes the differential pair M of field-effect tube M9, M10 composition9/M10, field
The differential pair M of effect pipe M11, M12 composition11/M12, a pair of of differential resistor is to R7/R8, tail current transistor M15, and operation puts
Big device OP3, differential pair M9/M10Differential resistor is connected to R7/R8, M11/M12It is directly connected to supply voltage；Tail current transistor M15
Grid loads the bias voltage V by being generated in common mode output bias circuitB1, resistance is to R7/R8Output end short circuit and be connected to
The negative input end of operational amplifier OP3, the voltage V of the positive input termination index proportion current generating circuit generation of OP3Y1, OP3's
Output end generates bias voltage VB2, and it is loaded into differential pair M11/M12Grid, constitute negative feedback loop.
Preferably, the differential pair M1/M2The differential signal V of grid loadIN+/VIN-Common-mode voltage also set at work
It is set to VCM, due to replica bias VB1Relationship, M14Grid bias and M13Grid bias be equal to VB1, M13Tail current etc.
In M14Tail current I0, i.e. I0=2* (VDD-VCM)/R, and VX2=VX1=VCM；Differential pair M1/M2Electric current be set as I1, difference
To M3/M4Electric current be set as I2, in I1And I2The relations of distribution in, I1In constant I0Shared ratio is by M in total current3Grid
Bias voltage VB2It determines.
Preferably, the negative feedback loop that the index proportion current generating circuit is formed so that VX3=VX2=VCM, Q2Branch
The electric current I on roadB2Equal to M in amplifier core circuit1The electric current of branch, i.e. IB2=I0/ 2=(VDD-VCM)/R, this is a perseverance
Fixed controllable value；Q simultaneously2The voltage V loaded in base stageRIt is a reference voltage, Q1The voltage loaded in base stage is one linear
Control voltage VC。
Preferably, Q1And Q2The electric current I of two branchesB1And IB2There is following relational expression to set up：
V in formula (1)T=kT/q, k are Boltzmann constants, and q is electron charge, and T is absolute temperature, that is to say, that IB1
And IB2It has exponent relation, in other words IB1And I0It has exponent relation；IB1This Exponential current is in Q1One is produced on the resistance R of branch
A voltage VY1, which is connected on the positive input terminal of operational amplifier OP3 of index proportion current biasing circuit, by negative anti-
Feedback generates bias voltage VB2。
Preferably, the index proportion current biasing circuit constitutes negative feedback loop so that voltage VY2And VY1It is equal, M9/
M10The electric current I of resistance R is flowed through on branch1/ 2 are equal to IB1：
Therefore, I1And I0It has exponent relation, wherein I0It is constant controllable.
Preferably, the gain expressions of continuously adjustable linearin-dB variable gain circuit structure are：
Wherein CoxIt is transistor gate oxide unit-area capacitance,It is M1The breadth length ratio of transistor, μnIt is moving for electronics
Shifting rate, R are load resistance, VDDFor supply voltage, VCMFor additional common-mode voltage, VRReference voltage in order to control, VCFor linear change
Control voltage, VT=kT/q, k are Boltzmann constants, and q is electron charge, and T is absolute temperature, are continuously adjusted linearin-dB
The gain of variable gain circuit structure is with control voltage VCLinear change and in linearin-dB change.
Advantages of the present invention：
Continuously adjustable accurate linearin-dB variable gain enlarged structure proposed by the present invention, passes through three groups of negative-feedback knots
Structure, the ingenious System design of two groups of biasing replicated architectures and a current distributing structure differential pair, in a structure of current rudder
Differential amplification pair of transistors, ensure total current it is constant i.e. output common mode voltage it is constant in the case of, it is simple and effective and smart
True realizes a transistor channel electric current exponentially changed as additional control voltage line changes, which determines
The mutual conductance of the transistor changes also with control voltage line and exponentially changes, and then realizes one and meet linearin-dB
The continuously adjustable variable gain amplifier structure of gain control.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and embodiments：
Fig. 1 is the schematic diagram of the continuously adjustable linearin-dB variable gain circuit structure of the present invention；
The relationship of the gain for the linearin-dB variable gain circuit that 1 parameter of Fig. 2 tables is realized and control voltage.
Specific implementation mode
As shown in Figure 1, the present invention includes four parts, 1 amplifying circuit core of upper left corner circuit module, upper right corner electricity
2 common mode output bias circuit of road module, 3 index proportion current generating circuit of lower left corner circuit module and lower right corner circuit module 4
Index proportion current biasing circuit.It will be described in detail below according to this four part to entirely inventing.
The input terminal of entire circuit is VIN+/VIN-, export as VOUT+/VOUT-, additional common-mode voltage is VCM, additional with reference to electricity
Press VR, additional linear gain control voltage VC.Gain, that is, output signal of amplifier and the ratio of input signal are with control voltage
VCLinear change and in linearin-dB change (index variation).
Amplifier core circuit is traditional differential pair structure of current rudder, as shown in the upper left corner of Fig. 1, by two pairs of differential pairs
M1/M2, M3/M4, a pair of of differential load resistance R1/R2(resistance value is R) and tail current bias transistor M13Composition, input are poor
Sub-signal is VIN+/VIN-, output difference signal is VOUT+/VOUT-If tail current transistor M13In bias current be I0, output
Differential signal VOUT+/VOUT-Common-mode voltage by supply voltage VDDSubtract the voltage drop 1/2*I on resistance R0* R, and amplifier
Gain is AV=gm1* R, wherein gm1It is transistor M1Mutual conductance, to make the gain of amplifier with VCLinear change and table
Reveal linearin-dB variation (index variation), it is necessary to so that transistor M1Mutual conductance exponentially change, in other words so that crystal
Pipe M1Channel current I1Exponentially change.In the design, we pass through replica bias technology so that M13Tail current I0It protects
It holds constant, while passing through cleverly Exponential current reproduction technology so that M1Channel current I1With control voltage VCLinear change
Change and shows index variation.The circuit structure of upper left corner amplifier core circuit is although seemingly traditional in the present invention
Current steer differential pair structure, but its invention core is loaded in M13The voltage V of gridB1, and load is in M3/M4The voltage of grid
VB2, the two voltages are respectively by the second part common mode output bias circuit and third, Part IV index ratio in Fig. 1 of the present invention
Example electric current generates and biasing circuit generates, and passes through VB1And VB2Synergy, on the one hand so that amplifier output common mode voltage
VX2Equal to additional syntype bias voltage VCM, it means that flow through the electric current I of amplifier load resistance0It is constant controllable, another party
Face to flow through M1Channel current I1With total current I0It has exponent relation, to reach the design that gain is in linearin-dB variation
Purpose.
Realize M13Tail current I0Constant method is as described below, should as shown in the common mode output bias circuit in the upper right corner Fig. 1
Two couples of differential pair M in partial circuit5/M6, M7/M8, differential load resistance R3/R4And tail current biasing transistor M14And Fig. 1
In 1 amplifier core circuit M of upper left corner circuit1/M2, M3/M4, differential load resistance R1/R2, tail current biasing transistor M13It is complete
It is complete consistent, the differential pair M in the upper right corner Fig. 1 circuit 25/M6Grid meets external common-mode voltage VCM, M7/M8The voltage added on grid comes
The bias voltage V caused by the lower right corner Fig. 1 circuit 4B2, the output of a pair of of differential load resistance in the upper right corner Fig. 1 circuit 2
End is shorted together and is connected to the positive input terminal of operational amplifier OP1, the negative input termination common mode reference voltage V of OP1CM, OP1
Output terminate M14Grid, form negative feedback loop, which forces the load resistance in the upper right corner Fig. 1 circuit 2
R3/R4Output end voltage VX1Equal to VCM, it means that following formula sets up VDD-1/2*I0* R=VCM, I0It can thus formula
It determines to be I0=2* (VDD-VCM)/R.Differential Input in the upper left corners Fig. 1 circuit 1 is to M1/M2The differential signal V of grid loadIN+/
VINCommon-mode voltage be also configured as V at workCM, due to replica bias VB1Relationship, i.e. 2 main body of circuit 1 and circuit in Fig. 1
Structure is identical, M14Grid bias and M13Grid bias be equal to VB1, the electric current relations of distribution in the upper left corners Fig. 1 circuit 1 and
The circuit 2 in the upper right corner is completely the same, i.e. M13Tail current be equal to M14Tail current I0That is I0=2* (VDD-VCM)/R, and VX2=
VX1=VCM, and I1And I2Relations of distribution I in other words1In constant I0Shared ratio is by M in total current3The biased electrical of grid
Press VB2It determines, lower left corner circuit 3 and 4 cooperation of the circuit in lower right corner generation bias voltage V in Fig. 1B2So that I1Value as I0's
A part simultaneously exponentially changes, and specific invention implementation method is described as follows.
The lower left corners Fig. 1 circuit 3 is by a pair of of differential configuration triode Q1And Q2, a pair of of differential resistor R5/R6, tail current crystal
Pipe M16And operational amplifier OP2 compositions, the positive input of operational amplifier OP2 terminate Q2Branch circuit load resistance R5/R6Output end
VX3, the M of the output termination of negative input termination additional common-mode voltage VCM, OP216Grid and M16And Q2Negative feedback loop is formed, is made
It obtains following relationship and sets up VX3=VX2=VCM.This means that Q2The electric current I of branchB2Equal to M in the upper left corners Fig. 1 circuit 11Branch
Electric current, that is, IB2=I0/ 2=(VDD-VCM)/R this be a constant controllable value.Q simultaneously2The voltage V loaded in base stageRIt is one
Reference voltage, Q1The voltage loaded in base stage is a Linear Control voltage VC, due to the characteristic of triode, Q1And Q2Two branch
The electric current I on roadB1And IB2There is following relational expression to set up：
V in formula (1)T=kT/q, k are Boltzmann constants, and q is electron charge, and T is absolute temperature, that is to say, that IB1
And IB2It has exponent relation, in other words IB1And I0It has exponent relation.IB1This Exponential current is in Q1The resistance R of branch5/R6Upper generation
One voltage VY1, which is connected on the positive input terminal of the operational amplifier OP3 of the lower right corner Fig. 1 circuit 4, passes through negative-feedback
Generate bias voltage VB2, specific design details is as follows.The lower right corner Fig. 1 circuit 4 is by differential pair M9/M10, M11/M12With tail current crystalline substance
Body pipe M15, a pair of of differential resistor R7/R8And operational amplifier OP3 composition, the value of transistor and load resistance component with
Component in the upper right corner Fig. 1 circuit 2 is completely the same, but connection type is slightly different, in upper right corner circuit 2, differential pair M5/
M6, M7/M8It is connected in parallel, the electric current of two branches is aggregated into differential resistor.And in lower right corner circuit 4, differential pair M9/M10
Differential resistor is connected to R7/R8, M11/M12It is directly connected to supply voltage, the purpose for the arrangement is that forming a kind of current distributing knot
Structure, by M9/M10, M11/M12The electric current of two branches separates, tail current transistor M in the lower right corner Fig. 1 circuit 415Grid load by
The bias voltage V generated in the upper right corner Fig. 1 circuit 2B1, a pair of of differential resistor R7/R8Output end short circuit and be connected to operation and put
The negative input end of big device OP3, the voltage V of 1 lower left corner circuit 3 of the positive input terminal map interlinking generation of OP3Y1, the output end of OP3, which generates, to close
The bias voltage V of keyB2And it is loaded into differential pair M11/M12Grid, constitute negative feedback loop so that voltage VY2And VY1It is equal,
This means that M9/M10The electric current I of resistance R is flowed through on branch1/ 2 are equal to IB1, that is to say, that following equation is set up：
Therefore, I1And I0It has exponent relation and I0It is a constant controllable value, due to replica bias, the upper lefts Fig. 1
M in angle circuit 11/M2Branch current I1With total tail current I0It is completely the same with the corresponding electric current in 2 circuit 3 of circuit, i.e.,
I in main amplifier1And I0Also meet the relationship of formula (2), and I0=2* (VDD-VCM)/R, be one can be outer by controlling
Add common-mode voltage VCMCome the electric current controlled.Due to I0In VCMIt is a definite value in the case of fixed, then I1Be exactly one with
Control voltage VC-VRLinear change and the value exponentially changed, due to M1The mutual conductance g of transistorm1It is proportional to electric current I1Two/
First power and one are with control voltage VC-VRLinear change and the value exponentially changed, therefore amplifier core electrocardio in Fig. 1
The gain on road is also with control voltage VC-VRLinear change and exponentially change, that is to say, that this is one and meets linearin-dB control
The variable gain enlarged structure of relationship processed.The gain expressions of the amplifier are：
Wherein CoxIt is transistor gate oxide unit-area capacitance,It is M1The breadth length ratio of transistor, μnIt is moving for electronics
Shifting rate, R are load resistance, VDDFor supply voltage, VCMFor additional common-mode voltage, VRReference voltage in order to control, VCFor linear change
Control voltage, VT=kT/q, k are Boltzmann constants, and q is electron charge, and T is absolute temperature.The electricity known to formula (3)
The gain of road module is with control voltage VCLinear change and exponentially change, in other words be in linearin-dB change.
A kind of novel linearin-dB variable gain electricity based on proposed by the present invention based on replica bias technology is given below
The specific implementation of line structure, using 0.13um CMOS technologies, the parameter of each key transistor is as shown in table 1 in example circuit.
Operational amplifier in circuit belongs to common circuit element, therefore is not specifically described in embodiment.The circuit is operated in
Under the supply voltage of 1.2V.The circuit is realized and emulated using parameter shown in table 1.Simulation result is as shown in Fig. 2, knot
Fruit shows under 1.2V supply voltages, using the common-mode voltage V of 0.8VCMWith the reference voltage V of 0.8VR, control voltage VCFrom
0.8V linear changes are to 0.9V, and the gain of circuit changes to 10dB from -8dB, and the variation of its decibel value is linear, that is, is realized
Accurately continuously adjustable linearin-dB gain control.Multiple same amplifying unit cascades, may be implemented broader gain control
Range processed, such as 4 same present invention propose amplifying circuit cascade, and the gain that -32dB to 40dB may be implemented controls.
1 new type of continuous adjusted decibels linear variable gain circuit structure parameter list proposed by the present invention of table
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
It cans understand the content of the present invention and implement it accordingly, it is not intended to limit the scope of the present invention.It is all main according to the present invention
The modification for wanting the Spirit Essence of technical solution to be done, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of continuously adjustable linearin-dB variable gain circuit structure, which is characterized in that including：Amplifier core circuit is total to
Mould output bias circuit, index proportion current generating circuit, index proportion current biasing circuit；
The amplifier core circuit is differential pair structure of current rudder, includes the differential pair M of field-effect tube M1, M2 composition1/M2, field
The differential pair M of effect pipe M3, M4 composition3/M4, a pair of of differential load resistance R1/R2And tail current biasing transistor M13, input
Differential signal is VIN+/VIN-, it is separately connected differential pair M1/M2Grid, output difference signal be VOUT+/VOUT-, VOUT+Connect M2/
M4Drain electrode, VOUT-Connect M1/M3Drain electrode, differential pair M1/M2Drain electrode pass through resistance R respectively1/R2Connect high level VDD, two
To differential pair M1/M2、M3/M4Source electrode be connected respectively to transistor M13Drain electrode, M13Source electrode ground connection；
The common mode output bias circuit generates voltage VB1Load is in M13Grid；
The index proportion current generating circuit and index proportion current biasing circuit are sequentially connected, and are generated voltage VB2 loads and are existed
M3/M4Grid；Pass through voltage VB1With voltage VB2Synergy so that tail current transistor M13In bias current be I0It is constant
Controllably, while M is flowed through1Channel current I1With I0It has exponent relation, to make gain change in linearin-dB.
2. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 1, which is characterized in that described
Common mode output bias circuit includes the differential pair M of field-effect tube M5, M6 composition5/M6, the differential pair of field-effect tube M7, M8 composition
M7/M8, a pair of of differential load resistance R3/R4And tail current biasing transistor M14；Differential pair M5/M6Grid connects external common mode electricity
Press VCM, M7/M8The voltage added on grid comes from bias voltage V caused by index proportion current biasing circuitB2, differential load
Resistance R3/R4Output end be shorted together and be connected to the positive input terminal of operational amplifier OP1, the negative input of OP1 terminates common mode
Reference voltage VCM, the output end voltage VB1 of OP1 meets M14Grid, formed negative feedback loop.
3. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 2, which is characterized in that described
The negative feedback loop that common mode output bias circuit is formed with amplifier core circuit, forces the load in common mode output bias circuit
Resistance R3/R4Output end voltage VX1Equal to VCM, then VDD-1/2*I0* R=VCM, I0Thus formula determines, i.e. I0=2* (VDD-
VCM)/R。
4. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 3, which is characterized in that described
Index proportion current generating circuit includes triode Q1、Q2The differential configuration triode Q of composition1/Q2, a pair of of differential resistor R5/R6,
Tail current transistor M16And operational amplifier OP2；The positive input of operational amplifier OP2 terminates Q2The output of branch circuit load resistance R
Hold VX3, the M of the output termination of negative input termination additional common-mode voltage VCM, OP216Grid and M16And Q2Form negative feedback loop.
5. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 4, which is characterized in that described
Index proportion current biasing circuit includes the differential pair M of field-effect tube M9, M10 composition9/M10, field-effect tube M11, M12 composition
Differential pair M11/M12, a pair of of differential resistor is to R7/R8, tail current transistor M15And operational amplifier OP3, differential pair M9/M10
Differential resistor is connected to R7/R8, M11/M12It is directly connected to supply voltage；Tail current transistor M15Grid load is exported by common mode
The bias voltage V generated in biasing circuitB1, resistance is to R7/R8Output end short circuit and be connected to the negative defeated of operational amplifier OP3
Enter end, the voltage V of the positive input termination index proportion current generating circuit generation of OP3Y1, the output end generation bias voltage of OP3
VB2, and it is loaded into differential pair M11/M12Grid, constitute negative feedback loop.
6. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 3, which is characterized in that described
Differential pair M1/M2The differential signal V of grid loadIN+/VIN-Common-mode voltage be also configured as V at workCM, due to replica bias
VB1Relationship, M14Grid bias and M13Grid bias be equal to VB1, M13Tail current be equal to M14Tail current I0, i.e. I0
=2* (VDD-VCM)/R, and VX2=VX1=VCM；Differential pair M1/M2Electric current be set as I1, differential pair M3/M4Electric current be set as I2,
In I1And I2The relations of distribution in, I1In constant I0Shared ratio is by M in total current3The bias voltage V of gridB2It determines.
7. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 5, which is characterized in that described
The negative feedback loop that index proportion current generating circuit is formed so that VX3=VX2=VCM, Q2The electric current I of branchB2Equal to amplifier
M in core circuit1The electric current of branch, i.e. IB2=I0/ 2=(VDD-VCM)/R, this is a constant controllable value；Q simultaneously2Base stage
The voltage V of upper loadRIt is a reference voltage, Q1The voltage loaded in base stage is a Linear Control voltage VC。
8. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 7, which is characterized in that Q1With
Q2The electric current I of two branchesB1And IB2There is following relational expression to set up：
V in formula (1)T=kT/q, k are Boltzmann constants, and q is electron charge, and T is absolute temperature, that is to say, that IB1And IB2
It has exponent relation, in other words IB1And I0It has exponent relation；IB1This Exponential current is in Q1An electricity is produced on the resistance R of branch
Press VY1, which is connected on the positive input terminal of operational amplifier OP3 of index proportion current biasing circuit, is produced by negative-feedback
Raw bias voltage VB2。
9. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 8, which is characterized in that described
Index proportion current biasing circuit constitutes negative feedback loop so that voltage VY2And VY1It is equal, M9/M10Flow through resistance R's on branch
Electric current I1/ 2 are equal to IB1：
Therefore, I1And I0It has exponent relation, wherein I0It is constant controllable.
10. new type of continuous adjusted decibels linear variable gain circuit structure according to claim 9, which is characterized in that even
The gain expressions of continuous adjusted decibels linear variable gain circuit structure are：
Wherein CoxIt is transistor gate oxide unit-area capacitance,It is M1The breadth length ratio of transistor, μnIt is the mobility of electronics, R
It is load resistance, VDDFor supply voltage, VCMFor additional common-mode voltage, VRReference voltage in order to control, VCFor the control of linear change
Voltage, VT=kT/q, k are Boltzmann constants, and q is electron charge, and T is absolute temperature, are continuously adjusted the variable increasing of linearin-dB
The gain of beneficial circuit structure is with control voltage VCLinear change and in linearin-dB change.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810220134.2A CN108563274B (en) | 2018-03-16 | 2018-03-16 | Linear variable gain circuit structure of continuously adjustable decibel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810220134.2A CN108563274B (en) | 2018-03-16 | 2018-03-16 | Linear variable gain circuit structure of continuously adjustable decibel |
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| CN108563274A true CN108563274A (en) | 2018-09-21 |
| CN108563274B CN108563274B (en) | 2019-12-20 |
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| CN111934631A (en) * | 2020-07-16 | 2020-11-13 | 中国科学院深圳先进技术研究院 | Exponential amplifier and wireless communication device |
| WO2021057609A1 (en) * | 2019-09-24 | 2021-04-01 | 上海艾为电子技术股份有限公司 | Current dac circuit and current output method |
| CN115296632A (en) * | 2022-10-08 | 2022-11-04 | 杭州万高科技股份有限公司 | Automatic gain control circuit with dual-mode continuous gain adjustment and high robustness |
| CN117277973A (en) * | 2023-11-22 | 2023-12-22 | 厦门科塔电子有限公司 | Negative feedback amplifier |
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| CN117277973A (en) * | 2023-11-22 | 2023-12-22 | 厦门科塔电子有限公司 | Negative feedback amplifier |
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