Low-offset band-gap reference voltage source

A reference voltage source and reference voltage technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the reference source output voltage error, the impact of bandgap reference voltage source output accuracy and stability, reference voltage error, etc. question

Active Publication Date: 2012-03-28
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology

[0015] However, in the above equation (5), the offset voltage V of the operational amplifier expressed in its third term OS However, it inevitably brings a certain error to the reference voltage of the bandgap reference voltage source, and the offset voltage V OS It is itself a function of temperature, so it may itself increase the temperature coefficient of the reference's output voltage
Therefore, the operational

Method used

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  • Low-offset band-gap reference voltage source

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[0037] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0038] refer to figure 2, shows a circuit diagram of an embodiment of a low offset bandgap reference voltage source according to the present invention, the bandgap reference voltage source is composed of a reference voltage generation circuit 21 and an offset voltage elimination circuit 22, wherein the reference The voltage generating circuit i...

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Abstract

The invention provides a low-offset band-gap reference voltage source. The voltage source comprises a reference voltage generation circuit and an offset voltage elimination circuit, wherein the reference voltage generation circuit receives a power supply voltage and generates a reference voltage; the offset voltage elimination circuit is used for eliminating the influence of the offset voltage ofan operational amplifier in the reference voltage generation circuit on the reference voltage, so that the reference voltage output by a band-gap reference voltage source is not influenced by temperature variation, offset voltage or other elements, and a reference voltage with higher accuracy and better stability can be acquired.

Description

technical field [0001] The invention relates to the field of power supplies, more specifically, to a low-offset bandgap reference voltage source. Background technique [0002] Reference voltage sources are widely used in analog and integrated circuits, and their accuracy and stability have an important impact on the performance of the entire system. Among them, the bandgap reference voltage source has become a reference voltage source due to its low temperature coefficient and high power supply voltage rejection ratio One of the most common implementations, the working principle of the traditional bandgap reference voltage source is to use the positive and negative temperature coefficients to cancel each other to generate a temperature-independent DC output voltage. refer to figure 1 , shows a circuit diagram of a traditional bandgap reference voltage source, which mainly generates a reference voltage by a reference voltage generating circuit, and the reference voltage gene...

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Application Information

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IPC IPC(8): G05F3/20
Inventor 吉米曾李焱
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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