Ultralow temperature drift high power supply rejection ratio band-gap reference voltage source

Abstract

The invention provides an ultralow temperature drift high power supply rejection ratio band-gap reference voltage source, and relates to the field of analog integrated circuit design. Mainly aimed at problems of temperature drift and power supply rejection ratio of an existing reference source, a comprehensive solution is provided. The band-gap reference voltage source comprises an independent current source circuit, a biasing circuit, a band-gap core circuit, and a PSRR enhancing circuit. The independent current source circuit is used to generate current which is basically independent of supply voltage to supply power. The bias circuit generates bias voltage used for operational amplification of the band-gap core circuit. The band-gap core circuit uses temperature compensation to obtain reference voltage. The power supply rejection ratio (PSRR) enhancing circuit provides grid bias voltage of the band-gap core circuit and improves power supply rejection ratio. Beneficial effects of the band-gap reference voltage source are that temperature coefficient of band-gap reference is greatly reduced, and power supply rejection ratio is improved. The band-gap reference voltage source is suitable to be used for a radio frequency identification power management module.

Description

field of invention [0001] The invention belongs to the technical field of electronic circuits, relates to the field of analog integrated circuit design, and in particular to an ultra-low temperature drift high power supply rejection ratio bandgap reference voltage source. Background technique [0002] The bandgap reference circuit is a very important basic unit module in an integrated circuit. This module provides a DC reference voltage for the system, and is widely used in converters, phase-locked loops and power management chips. Its temperature coefficient and ability to resist power supply noise greatly affect the performance of other circuits in the system, which requires improving the accuracy and stability of the bandgap reference, which is the focus and difficulty in the design of analog integrated circuit systems. [0003] figure 1 For the basic bandgap reference circuit structure, it provides a reference voltage insensitive to temperature and power supply voltage...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of large temperature coefficient of first-order compensation and poor suppression of power supply noise, and proposes an ultra-low temperature drift high power supply rejection ratio bandgap reference voltage source circuit

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