An operational amplification circuit capable of adjusting the reference voltage value

A technology of operational amplifier circuit and reference voltage, which is applied in the direction of amplifier combination and improved amplifier to reduce temperature/power supply voltage changes, etc. It can solve the problem of non-adjustable reference voltage and achieve low cost, high reliability and simple circuit structure.

Pending Publication Date: 2019-06-07
四川爱创科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the reference voltage of the existing operational amplifier circuit cannot be adjusted, and propose an operational amplifier circuit with adjustable reference voltage value

Method used

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  • An operational amplification circuit capable of adjusting the reference voltage value
  • An operational amplification circuit capable of adjusting the reference voltage value
  • An operational amplification circuit capable of adjusting the reference voltage value

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Embodiment 1

[0026] The operational amplifier circuit with adjustable reference voltage value described in Embodiment 1 of the present invention, such as figure 1 As shown, it includes: a reference voltage adjustment circuit and a sampling signal amplification circuit. The reference voltage adjustment circuit includes a power input terminal VIN. The sampling signal amplification circuit includes a signal input terminal SIN and a signal output terminal SOUT. The reference voltage adjustment circuit is connected to the sampling signal amplification circuit. The reference voltage adjustment circuit adjusts the voltage input from the power input terminal VIN and then inputs it as a reference voltage to the sampling signal amplification circuit; the sampling signal amplification circuit amplifies the sampling signal input from the signal input terminal SIN and outputs it to the signal output terminal SOUT .

[0027] optional, such as figure 1 As shown, the reference voltage adjustment circuit ...

Embodiment 2

[0037] The circuit structure and principle of this embodiment are basically the same as those of Embodiment 1. Refer to Embodiment 1 for relevant points. The difference is that the sampling signal is input into the second operational amplifier U2 in a different way, such as figure 2 As shown, the sampling signal amplifying circuit includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, a third capacitor C3 and a second operational amplifier U2, The output terminal of the first operational amplifier U1 is connected to the non-inverting input terminal of the second operational amplifier U2 through the third resistor R3, the non-inverting input terminal of the second operational amplifier U2 is grounded through the fourth resistor R4, and the second operational amplifier U2 is grounded through the fourth resistor R4. The negative phase input terminal of the amplifier U2 is respectively connected ...

Embodiment 3

[0040] The circuit structure and principle of this embodiment are basically the same as those of Embodiment 1. Refer to Embodiment 1 for relevant points. The difference is that the sampling signal is input into the second operational amplifier U2 in a different way, such as image 3 As shown, the sampling signal amplifying circuit includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second capacitor C2, a third capacitor C3 and a second operational amplifier U2, The output terminal of the first operational amplifier U1 is connected to the non-inverting input terminal of the second operational amplifier U2 through the third resistor R3, the non-inverting input terminal of the second operational amplifier U2 is grounded through the fourth resistor R4, and the second operational amplifier U2 is grounded through the fourth resistor R4. The positive-phase input terminal of the amplifier U2 is connected to the signal ...

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PUM

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Abstract

The invention relates to the field of electronic circuits. In order to solve the problem that the reference voltage of an existing operational amplifier circuit cannot be adjusted, the invention provides an operational amplification circuit capable of adjusting the reference voltage value, which comprises a reference voltage adjusting circuit and a sampling signal amplification circuit. the reference voltage adjusting circuit comprises a power input terminal, the sampling signal amplification circuit comprises a signal input terminal and a signal output terminal, and the reference voltage adjusting circuit is connected with the sampling signal amplification circuit; The reference voltage regulating circuit regulates a voltage value input by a power supply and then inputs the voltage valueas reference voltage to the sampling signal amplifying circuit; And the sampling signal amplification circuit amplifies a sampling signal input by the signal input terminal and outputs the amplifiedsampling signal to the signal output terminal. The reference voltage of the amplifying circuit can be flexibly adjusted while a sampling signal is effectively amplified through the reference voltage adjusting circuit, and the amplifying circuit is suitable for signal amplifying occasions with different reference voltage requirements.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an operational amplifier circuit. Background technique [0002] The reference voltage is a reference voltage that guarantees a stable voltage value. The operational amplifier circuit usually uses the reference voltage to set the signal bias point voltage, protection threshold and other parameters. The reference voltage of the existing operational amplifier circuit is generally directly using the internal voltage provided by the signal processing module, or through the reference voltage source The reference voltage provided is generally 1.25V or 2.5V. The reference voltage is fixed and cannot be adjusted, and is not suitable for some application scenarios. For example, some operational amplifier circuits require a larger reference voltage. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the reference voltage of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F3/68
Inventor 向哲爽梅吉超邓曦
Owner 四川爱创科技有限公司
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