High power supply rejection ratio and low temperature drift band-gap reference voltage source

Abstract

The invention discloses a high power supply rejection ratio and low temperature drift band-gap reference voltage source which comprises a biasing circuit, an operational amplifier, a starting circuit,a preadjusting circuit, a temperature compensating circuit and a band-gap reference core circuit, wherein the biasing circuit is used for providing direct-current bias current for the operational amplifier, the design of the secondary operational amplifier is used for suppressing an electric potential drop low temperature drift coefficient of a band-gap reference source; the design of the starting circuit is used for the band-gap reference source to break away from a degeneracy point state; the design of the preadjusting circuit is used for the band-gap reference source to break away from direct power supply of power voltage to improve an output power supply rejection ratio; the design of the temperature compensating circuit is used for reducing a temperature drift coefficient of the whole circuit; the band-gap reference core circuit utilizes a current mode voltage reference structure and is used for reducing output voltage of the band-gap reference source. According to the band-gap voltage reference source disclosed by the invention, the preadjusting circuit structure is introduced, and high-order temperature compensation is performed; compared with traditional band-gap referencesource, the band-gap reference source has a higher power supply rejection ratio and a lower temperature drift coefficient and can be suitable for high-accuracy work requirements.

Description

technical field [0001] The invention relates to the field of analog integrated circuit design, in particular to a low-temperature drift bandgap reference voltage source with high power supply rejection ratio. Background technique [0002] In recent years, with the rapid development of the integrated circuit industry, the reference source is an indispensable component circuit in the analog chip, and its performance has attracted more and more attention. The bandgap reference source is widely used in registers, Linear voltage regulator, digital-to-analog conversion circuit. The main function of the bandgap reference source is to provide a stable reference voltage for the circuits of other modules, so that they can get predictable and repeatable results. The performance of the reference voltage source is decisive for the power consumption, speed, and stability of the entire circuit. effect. In order to make the circuit work normally in different external environments, and the...

AI Technical Summary

Problems solved by technology

At the same time, in the traditional bandgap reference source, the op amp is usually used to V BE The low-order term of the temperature coefficient is compensated, but the temperature drift coefficient achieved in this way can only reach a minimum of 20ppm / °C, which cannot meet the temperature stability requirements of the reference voltage source in high-precision places

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