Operational amplifier circuit and reference voltage generating circuit module

A technology of operational amplifiers and reference voltages, applied in differential amplifiers, DC-coupled DC amplifiers, instruments, etc., can solve problems such as increased deviation and increased dispersion of reference voltages, and achieve low power consumption, reduced dispersion, and small area The effect of spending

Inactive Publication Date: 2015-05-06
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the application of the reference voltage generation circuit, the offset voltage of the operational amplifier will be directly reflected on the reference voltage output, increasing the dispersion of the reference voltage and increasing the deviation

Method used

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  • Operational amplifier circuit and reference voltage generating circuit module
  • Operational amplifier circuit and reference voltage generating circuit module
  • Operational amplifier circuit and reference voltage generating circuit module

Examples

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Embodiment Construction

[0021] see figure 1 , and combined with figure 2 , 3 As shown, the reference voltage generation circuit module in the following embodiments includes: a reference voltage generation circuit, an operational amplifier circuit, and a low-pass filter circuit. The operational amplifier circuit includes an operational amplifier and a chopping detuning circuit.

[0022] The influence of the offset voltage of the operational amplifier on the reference voltage Vref can be derived from the transfer function.

[0023] When the offset voltage is not considered, then there is

[0024] Vref = R 3 R 1 V T ln n + R 2 R 1 V BE .

[0025] When taking into account the offse...

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PUM

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Abstract

The invention discloses an operational amplifier circuit. The operational amplifier circuit comprises an operational amplifier and a chopping offset elimination circuit for eliminating an offset signal and flicker noise of the operational amplifier. The invention further discloses a reference voltage generating circuit module. The reference voltage generating circuit module comprises a reference voltage generating circuit, an operational amplifier, a chopping offset elimination circuit and a filtering circuit, wherein the reference voltage generating circuit is used for generating voltage with a zero temperature coefficient and current with a zero temperature coefficient; the operational amplifier is used for providing feedback for the reference voltage generating circuit in order that the output of the reference voltage generating circuit is stabilized at a required working point; the chopping offset elimination circuit is used for modulating the inherent offset voltage and the low-frequency flicker noise of the operational amplifier in order to modulate the influence of the offset of the operational amplifier on a reference voltage generated by the reference voltage generating circuit; and the filtering circuit is used for filtering the offset signal modulated by the offset elimination circuit and keeping a useful reference voltage signal. Through adoption of the operational amplifier circuit and the reference voltage generating circuit module, the offset and the flicker noise of the operational amplifier can be eliminated, and the accuracy is increased.

Description

technical field [0001] The invention relates to an analog circuit, in particular to an operational amplifier circuit. The invention also relates to a reference voltage generating circuit module using the operational amplifier circuit. Background technique [0002] In most analog circuits, operational amplifier circuits are used. Under the requirement of high-precision application environment, the accuracy of operational amplifier becomes more and more important, and the inherent offset and low-frequency flicker noise of operational amplifier become more and more intolerable, so the offset and low-frequency flicker noise should be eliminated. [0003] For the application in the reference voltage generation circuit, the offset voltage of the operational amplifier will be directly reflected on the reference voltage output, increasing the dispersion of the reference voltage, resulting in an increase in deviation. Contents of the invention [0004] The technical problem to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45G05F1/56
Inventor 张美鑫
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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