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A low-voltage high-precision bandgap reference circuit

A reference circuit, low voltage and high technology, applied in the field of low voltage and high precision bandgap reference circuit, to achieve good temperature characteristics, improve work performance and reliability

Active Publication Date: 2022-02-22
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a low-voltage high-precision bandgap reference circuit to solve the problem of temperature compensation of high-precision bandgap reference

Method used

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  • A low-voltage high-precision bandgap reference circuit
  • A low-voltage high-precision bandgap reference circuit
  • A low-voltage high-precision bandgap reference circuit

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Embodiment Construction

[0027] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0028] The first embodiment of the present invention relates to a low-voltage high-precision bandgap reference circuit, including: a positive temperature current generating circuit for generating a current that is positively related to absolute temperature; a negative temperature current generating circuit for generating a current that is negatively related to absolute temperature related current; a startup circuit, used to pre...

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Abstract

The invention relates to a low-voltage high-precision bandgap reference circuit, comprising: a positive temperature current generating circuit for generating a current positively correlated with an absolute temperature; a negative temperature current generating circuit for generating a current negatively correlated with an absolute temperature; The compensation circuit is used to generate a high temperature compensation current when the temperature rises; the low temperature compensation circuit is used to generate a low temperature compensation current when the temperature decreases; the current voltage conversion circuit is used to adopt the high temperature compensation current and the low temperature compensation current generated by the pair The current positively correlated with the absolute temperature and the current negatively correlated with the absolute temperature are compensated, and the compensated current is converted into a voltage. According to the curve characteristics, the present invention introduces or draws positive temperature characteristic compensation current at high temperature and low temperature, has better temperature characteristics, and improves the working performance and reliability of the system.

Description

technical field [0001] The invention relates to a reference circuit in the technical field of integrated circuits, in particular to a low-voltage high-precision bandgap reference circuit. Background technique [0002] The reference voltage source is an essential part of analog circuits and digital-analog hybrid circuits, and its performance directly determines the output accuracy and stability of analog circuits and digital-analog hybrid circuits. There are three commonly used reference sources in integrated circuits, namely: XFET reference source, buried Zener (zener) reference source and bandgap reference source. The bandgap reference source has better performance and is widely used. In precision-sensitive integrated circuits, the temperature coefficient of the bandgap reference source is one of the most important properties, such as digital-to-analog and analog-to-digital converters. Only a stable bandgap reference source can achieve accurate digital codewords and analog ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 沈洁陈后鹏倪圣兰李喜宋志棠
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI