CN211959170U - Automatic transconductance control amplifying circuit capable of outputting larger current - Google Patents
Automatic transconductance control amplifying circuit capable of outputting larger current Download PDFInfo
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- CN211959170U CN211959170U CN202021089216.7U CN202021089216U CN211959170U CN 211959170 U CN211959170 U CN 211959170U CN 202021089216 U CN202021089216 U CN 202021089216U CN 211959170 U CN211959170 U CN 211959170U
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Abstract
The utility model discloses an automatic transconductance control amplifier circuit of exportable bigger current, including input uinControl end UcOutput terminal ioutVoltage controlled amplifier U1Operational amplifier U2Power amplifier U3Operational amplifier U4Capacitor C1Capacitor C2Resistance R1Resistance R2Resistance R3Resistance R4Resistance R5Resistance R6Resistance R7Resistance R8Resistance R9And a diode D1Voltage controlled amplifier U1Model number of (c) is VCA 610. The automatic transconductance control amplifying circuit has the functions of automatically controlling a transconductance value and outputting larger current, the input is an alternating current voltage signal, the output is an alternating current signal, and the peak value of the current signal is controlled by direct current control voltage; when the direct current control voltage is stable, the output current value is stable and does not change along with the change of the amplitude of the input alternating current voltage signal, and the method can be used for designing circuits such as a large-current alternating current constant current source and the like.
Description
Technical Field
The utility model relates to a transconductance control amplifier circuit design field, concretely relates to automatic transconductance control amplifier circuit of exportable bigger current.
Background
A transconductance operational amplifier (OTA) is a voltage-input, current-output electronic amplifier whose output-to-input ratio is referred to as the transconductance value. The transconductance operational amplifier can not only carry out signal operation and processing in various linear and nonlinear analog circuits and systems, but also can be used as an interface circuit between a voltage signal variable and a current mode signal processing system, convert a voltage signal to be processed into a current signal and then send the current signal into the current mode system for processing. The transconductance operational amplifier has the advantages of simple circuit structure, good high-frequency characteristic, convenience in integration and the like, has been widely applied in the field of analog integrated circuits, and becomes one of research hotspots in the field of microelectronics. The input resistance and the output resistance of the ideal transconductance operational amplifier are infinite, and a plurality of transconductance operational amplifier chips exist in the market.
A transconductance operational amplifier typically has an additional current input to control the transconductance of the amplifier. When the current value of the current input end is fixed, the transconductance value is fixed; the output current of the transconductance operational amplifier changes along with the change of the input voltage, the function of automatically controlling the transconductance value cannot be realized, the constant output current cannot be realized, and the output current value is limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an automatic transconductance control amplifier circuit of exportable more heavy current is provided, solve the unable function that realizes automatic control transconductance value and export more heavy current of current transconductance control amplifier circuit.
The utility model provides an above-mentioned technical problem's technical scheme as follows: an automatic transconductance control amplifying circuit comprises an input end uinControl end UcOutput terminal ioutVoltage controlled amplifier U1Operational amplifier U2Power amplifier U3Operational amplifier U4Capacitor C1Capacitor C2Resistance R1Resistance R2Resistance R3Resistance R4Resistance R5Resistance R6Resistance R7Resistance R8Resistance R9And a diode D1Said voltage controlled amplifier U1Model number VCA610, the voltage controlled amplifier U1Pin 1 and input terminal uinConnected, the voltage control amplifier U1Pin 8 of the voltage control amplifier U is grounded, and the voltage control amplifier U1Pin 2 of the voltage control amplifier U is grounded, and the voltage control amplifier U1Pin 6 of the voltage control amplifier U is connected to a power supply VSS, and the voltage control amplifier U1Pin 7 of the voltage control amplifier U is connected with a power supply VEE1Pin 3 and resistor R1Is connected to one end of the voltage control amplifier U1Pin 3 and resistor R2Is connected to one end of the voltage control amplifier U1Pin 3 and capacitor C1Is connected with the positive terminal of the voltage control amplifier U1Pin 3 and resistor R4Is connected to one end of the resistor R1Is connected to a power supply VEE, the resistor R2Is grounded, the other end of the capacitor C is grounded1The negative terminal of the resistor R is grounded, and the resistor R is connected with the ground4Another terminal of (1) and a diode D1Is connected to the cathode of the diode D1Anode and operational amplifier U2Is connected to pin 6 of the operational amplifier U2Pin 6 and capacitor C2Is connected to one end of the capacitor C2And the other end of the operational amplifier U2Is connected to pin 2 of the operational amplifier U2Pin 2 and resistor R3Is connected to one end of the resistor R3Another end of (1) and a control end UcConnected to the operational amplifier U2Pin 3 and operational amplifier U4Is connected to the 6 th pin of the operational amplifier U4Pin 6 and resistor R9Is connected to one end of the resistor R9And the other end of the operational amplifier U4Is connected to pin 2 of the operational amplifier U4Pin 7 of the operational amplifier U is connected with a power supply VSS, and the operational amplifier U4Pin 4 of the operational amplifier U is connected to a power supply VEE, and the operational amplifier U4Pin 3 and resistor R8Is connected to one end of the resistor R8Is grounded, the operational amplifier U4Pin 3 and resistorR6Is connected to one end of the resistor R6And the other end of the same and a power amplifier U3Is connected to the 4 th pin of the operational amplifier U4Pin 2 and resistor R7Is connected to one end of the resistor R7Another end of (1) and an output terminal ioutConnected to said resistor R5And a power amplifier U3Is connected to the 4 th pin of the resistor R5Another end of (1) and an output terminal ioutConnected to the power amplifier U3Pin 4 is connected to pin 2, a power amplifier U3Pin 1 and voltage control amplifier U1Is connected to the 5 th pin of the power amplifier U3Pin 5 of the power amplifier is connected with a power supply VSS, and the power amplifier U3Pin 3 of which is connected to a power supply VEE.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the operational amplifier U2The model of (2) is OPA620, and the beneficial effect of this step of adoption is that OPA620 is the accurate operational amplifier of broadband, makes control loop control more accurate, and stabilizing rate is faster.
Further, the power amplifier U3The model of the power amplifier is TDA2030, and the method has the advantages that the TDA2030 is a classic power amplifier, the cost performance is high, the performance is stable, and the technology is mature.
Further, the operational amplifier U4Model number of (4) is OP37, the beneficial effect of adopting this step is that the working bandwidth of the circuit is wider.
Further, the input end uinA sinusoidal alternating voltage signal is input.
Further, the control end UcA DC voltage signal is input.
The utility model has the advantages that: in the present invention, the automatic transconductance control amplifying circuit has the functions of automatically controlling transconductance value and outputting larger current, the input is an ac voltage signal, the output is an ac current signal, and the peak value of the current signal is controlled by the dc control voltage; when the direct current control voltage is stable, the output current value is stable and does not change along with the change of the amplitude of the input alternating current voltage signal, and the method can be used for designing circuits such as a large-current alternating current constant current source and the like.
Drawings
FIG. 1 is a schematic diagram of the present invention
FIG. 2 shows an input voltage u when a sinusoidal AC voltage signal having a peak value of 0.5V is inputted in an embodiment of the present inventioninWaveform and output current ioutWave form
FIG. 3 shows an input voltage u when a sinusoidal AC voltage signal having a peak value of 1V is inputted in an embodiment of the present inventioninWaveform and output current ioutWave form
FIG. 4 shows an input voltage u when a sinusoidal AC voltage signal having a peak value of 1.5V is inputted in an embodiment of the present inventioninWaveform and output current ioutWave form
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in FIG. 1, an automatic transconductance control amplifying circuit includes an input terminal uinControl end UcOutput terminal ioutVoltage controlled amplifier U1Operational amplifier U2Power amplifier U3Operational amplifier U4Capacitor C1Capacitor C2Resistance R1Resistance R2Resistance R3Resistance R4Resistance R5Resistance R6Resistance R7Resistance R8Resistance R9And a diode D1Voltage controlled amplifier U1Model VCA610, voltage controlled amplifier U1Pin 1 and input terminal uinConnected, voltage controlled amplifier U1Pin 8 of the voltage control amplifier U1Pin 2 of the voltage control amplifier U1Pin 6 of the voltage control amplifier U is connected with a power supply VSS1Pin 7 of the amplifier is connected to a power supply VEE, and a voltage control amplifier U1Pin 3 and resistor R1One end of the two ends of the connecting rod is connected,voltage controlled amplifier U1Pin 3 and resistor R2Is connected to a voltage control amplifier U1Pin 3 and capacitor C1Is connected with the positive terminal of the voltage control amplifier U1Pin 3 and resistor R4Is connected to one end of a resistor R1Is connected with a power supply VEE, a resistor R2The other end of which is grounded, a capacitor C1The negative terminal of the resistor R is grounded4Another terminal of (1) and a diode D1Is connected to the cathode of a diode D1Anode and operational amplifier U2Is connected to pin 6 of an operational amplifier U2Pin 6 and capacitor C2Is connected to one terminal of a capacitor C2And the other end of the operational amplifier U2Is connected to pin 2 of an operational amplifier U2Pin 2 and resistor R3Is connected to one end of a resistor R3Another end of (1) and a control end UcConnected, operational amplifier U2Pin 3 and operational amplifier U4Is connected with the 6 th pin of the operational amplifier U4Pin 6 and resistor R9Is connected to one end of a resistor R9And the other end of the operational amplifier U4Is connected to pin 2 of an operational amplifier U4Pin 7 of the operational amplifier is connected to a power supply VSS, and an operational amplifier U4Pin 4 of the operational amplifier is connected with a power supply VEE, and an operational amplifier U4Pin 3 and resistor R8Is connected to one end of a resistor R8Is grounded, an operational amplifier U4Pin 3 and resistor R6Is connected to one end of a resistor R6And the other end of the same and a power amplifier U3Is connected to the 4 th pin of the operational amplifier U4Pin 2 and resistor R7Is connected to one end of a resistor R7Another end of (1) and an output terminal ioutConnected by a resistor R5And a power amplifier U3Is connected to pin 4 of the resistor R5Another end of (1) and an output terminal ioutConnected, a power amplifier U3Pin 4 is connected to pin 2, a power amplifier U3Pin 1 and voltage control amplifier U1Is connected to pin 5 of the power amplifier U3Pin 5 of the power amplifier is connected to a power supply VSS, and a power amplifier U3Pin 3 of (2) is connected to a power supply VEE。
In the embodiment of the present invention, the operational amplifier U2Model number of (2) is OPA 620.
In the embodiment of the present invention, the power amplifier U3Model number of (1) is TDA 2030.
In the embodiment of the present invention, the operational amplifier U4Model number of OP 37.
In the embodiment of the present invention, the input terminal uinA sinusoidal alternating voltage signal is input.
In the embodiment of the present invention, the control end UcA DC voltage signal is input.
The utility model discloses a theory of operation does:
voltage control amplifier U in the circuit of FIG. 11For VCA610, the voltage amplification of which is controlled by the value of the input voltage at pin 3, operational amplifier U2And the voltage comparison function is realized. Capacitor C1For charging and discharging capacitors, R4Is C1The charging current limiting resistor. Resistance R1And R2Not only for providing a static operating voltage to pin 3 of the VCA610, but also for providing a capacitor C1The discharge resistance of (1). Diode D1The detection function is realized. Capacitor C2The loop phase is compensated, and the capacity is small. Resistance R5For sampling the resistor, output current signal ioutLinearly converted to a voltage signal. Operational amplifier U4And a resistance R7、R8、R9、R10Together form a differential amplifier circuit, and R7＝R8，R9＝R10。
Power amplifier U3Is a classic TDA2030 power amplifier, U3The voltage follower is formed, so that the automatic transconductance control amplifying circuit has a function of outputting larger current.
During static operation, the-5V voltage of the power supply VEE passes through the resistor R1And R2Capacitor C for charging and discharging1Providing a quiescent operating voltage of-2.5V, with the VCA610 input to u at maximum amplificationinThe ac voltage signal of (a) is amplified.
Power amplifier U3Output current signal ioutVia a resistance R5Sampling to obtain voltage signal, and processing by operational amplifier U4Differential amplification to obtain an AC voltage signal uf. When u isfIs greater than the control end UcAt the value of the DC voltage, the operational amplifier U2Output high level to make diode D1Conducting, operational amplifier U2By charging a current-limiting resistor R4Capacitor C1Charging to C1The potential rises and the amplification of the VCA610 is controlled to decrease until the power amplifier U3Output current signal ioutCorresponding voltage signal ufIs equal to the control terminal UcThe value of the dc voltage of (1).
Let the capacitor C1A bipolar capacitance with a capacitance of 100nF, a capacitance C2Unipolar capacitor with capacity of 50pF, resistor R1Resistance R2Are all 50k omega, and the resistance R8Resistance R9Are all 500k omega, and the resistance R3Has a resistance value of 100 omega and a resistance R4Resistance R6And a resistance R7Are all 1k omega, and the resistance R5Has a resistance value of 0.1 omega, and a diode D1The model of the power supply is 1N3208, the power supply VSS is a +5V end of a positive and negative 5V double power supply, and the power supply VEE is a-5V end of the positive and negative 5V double power supply.
When inputting signal uinIf the signal is input when the signal is a sine alternating voltage signal
And a is the peak value of the voltage, ω is the angular frequency of the signal,
is the initial phase; then the current signal i is outputoutCan be expressed as:
where b is the peak value of the current signal. Output current signal ioutAfter sampling and differential amplification, the operational amplifier U4Output voltage of
When the automatic transconductance control amplifying circuit works stably, the operational amplifier U2The DC voltage at the reverse input end is equal to the AC voltage at the non-inverting input end in peak value, i.e.
Finishing to obtain:
therefore, the output current signal i of the automatic transconductance control amplifying circuitoutPeak b of (1) is controlled by terminal UcControlling the direct current voltage value; control voltage UcAt fixed time, output current signal ioutIs kept stable and is not basically influenced by the input voltage uinThe effect of the amplitude; this is the transconductance value of the automatic transconductance control amplifying circuit
Automatic change.
Due to the voltage control amplifier U1The output is connected with a power amplifier U with the model number of TDA20303TDA2030 with power amplification and output current ioutNo longer voltage controlled amplifier U1Is limited to the maximum output current value (80 mA).
The simulation circuit, output i, was constructed in Multisim 13 according to fig. 1outThe load resistance connected to 1 Ω is shown by the formula (5)If the DC voltage U of the control terminalcWhen the voltage is 2V, after the work is stable, the automatic transconductance control amplifying circuit outputs a current signal ioutShould be 400 mA. FIG. 2 shows an input signal uinWhen the frequency is 10kHz and the peak value is 0.5V of sinusoidal alternating voltage signal, the input voltage u of the automatic transconductance control amplifying circuitinAnd an output current ioutThe waveform of (2). FIG. 3 shows an input voltage u of the AGC circuit when the peak value of the input signal is changed to 1VinAnd an output current ioutThe waveform of (2). FIG. 4 shows the input voltage u of the AGC circuit when the peak value of the input signal is changed to 1.5VinAnd an output current ioutThe waveform of (2). As can be seen from fig. 2, fig. 3 and fig. 4, the automatic transconductance control amplifying circuit realizes the transconductance value gmIs changed automatically, the output current signal i is changed when the input voltage amplitude is changedoutWill eventually stabilize to 400mA and the current signal ioutHas a peak value of 400mA larger than the voltage control amplifier U1The maximum output current value of 80mA, meets the expected target.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. An automatic transconductance control amplifying circuit capable of outputting larger current is characterized by comprising an input end uinControl end UcOutput terminal ioutVoltage controlled amplifier U1Operational amplifier U2Power amplifier U3Operational amplifier U4Capacitor C1Capacitor C2Resistance R1Resistance R2Resistance R3Resistance R4Resistance R5Resistance R6Resistance R7Resistance R8Resistance R9And a diode D1Said voltage controlled amplifier U1Model number of VCA610, the voltage control amplifier U1Pin 1 and input terminal uinConnected, the voltage control amplifier U1Pin 8 of the voltage control amplifier U is grounded, and the voltage control amplifier U1Pin 2 of the voltage control amplifier U is grounded, and the voltage control amplifier U1Pin 6 of the voltage control amplifier U is connected to a power supply VSS, and the voltage control amplifier U1Pin 7 of the voltage control amplifier U is connected with a power supply VEE1Pin 3 and resistor R1Is connected to one end of the voltage control amplifier U1Pin 3 and resistor R2Is connected to one end of the voltage control amplifier U1Pin 3 and capacitor C1Is connected with the positive terminal of the voltage control amplifier U1Pin 3 and resistor R4Is connected to one end of the resistor R1Is connected to a power supply VEE, the resistor R2Is grounded, the other end of the capacitor C is grounded1The negative terminal of the resistor R is grounded, and the resistor R is connected with the ground4Another terminal of (1) and a diode D1Is connected to the cathode of the diode D1Anode and operational amplifier U2Is connected to pin 6 of the operational amplifier U2Pin 6 and capacitor C2Is connected to one end of the capacitor C2And the other end of the operational amplifier U2Is connected to pin 2 of the operational amplifier U2Pin 2 and resistor R3Is connected to one end of the resistor R3Another end of (1) and a control end UcConnected to the operational amplifier U2Pin 3 and operational amplifier U4Is connected to pin 6 of the operational amplifier U4Pin 6 and resistor R9Is connected to one end of the resistor R9And the other end of the operational amplifier U4Is connected to pin 2 of the operational amplifier U4Pin 7 of the operational amplifier U is connected with a power supply VSS, and the operational amplifier U4Pin 4 of the operational amplifier U is connected to a power supply VEE, and the operational amplifier U4Pin 3 and resistor R8Is connected to one end of the resistor R8Is grounded, the operational amplifier U4Pin 3 and resistor R6Is connected to one end of the resistor R6And the other end of the same and a power amplifier U3Is connected to the 4 th pin of the operational amplifier U42 nd pinAnd a resistor R7Is connected to one end of the resistor R7Another end of (1) and an output terminal ioutConnected to said resistor R5And a power amplifier U3Is connected to the 4 th pin of the resistor R5Another end of (1) and an output terminal ioutConnected to the power amplifier U3Pin 4 is connected to pin 2, a power amplifier U3Pin 1 and voltage control amplifier U1Is connected to the 5 th pin of the power amplifier U3Pin 5 of the power amplifier is connected with a power supply VSS, and the power amplifier U3Pin 3 of which is connected to a power supply VEE.
2. The automatic transconductance control amplification circuit capable of outputting larger current according to claim 1, wherein the operational amplifier U is2Model number of (2) is OPA 620.
3. The automatic transconductance control amplification circuit capable of outputting larger current according to claim 1, wherein the power amplifier U is3Model number of (1) is TDA 2030.
4. The automatic transconductance control amplification circuit capable of outputting larger current according to claim 1, wherein the operational amplifier U is4Model number of OP 37.
5. The automatic transconductance control amplifying circuit capable of outputting larger current according to claim 1, wherein the input terminal u isinA sinusoidal alternating voltage signal is input.
6. The automatic transconductance control amplifying circuit capable of outputting larger current according to claim 1, wherein the control terminal U iscA DC voltage signal is input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021089216.7U CN211959170U (en) | 2020-06-12 | 2020-06-12 | Automatic transconductance control amplifying circuit capable of outputting larger current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021089216.7U CN211959170U (en) | 2020-06-12 | 2020-06-12 | Automatic transconductance control amplifying circuit capable of outputting larger current |
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| Publication Number | Publication Date |
|---|---|
| CN211959170U true CN211959170U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021089216.7U Expired - Fee Related CN211959170U (en) | 2020-06-12 | 2020-06-12 | Automatic transconductance control amplifying circuit capable of outputting larger current |
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| CN (1) | CN211959170U (en) |
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2020
- 2020-06-12 CN CN202021089216.7U patent/CN211959170U/en not_active Expired - Fee Related
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Granted publication date: 20201117 |