Bandgap reference with high power supply rejection ratio

Abstract

The invention discloses a bandgap reference with a high power supply rejection ratio, and belongs to the technical field of electronic circuits. The bandgap reference comprises a power automatic biasing module, a starting module, a bandgap reference core module and a biasing module, power voltage is converted into a first power rail signal by the power automatic biasing module through a seventh NMOS tube to serve as a power rail of the biasing module, biasing is established for the biasing module by the starting module and the power automatic biasing module, and biasing is provided for the bandgap reference core module by the biasing module; second and third switch tubes of the starting circuit operate to prevent a whole circuit from being maintained in a zero state when power is established, and the second and third switch tubes of the starting circuit stop operating after the circuit enters a normal working condition; a resistance network in the starting circuit is used for adjustingthe negative temperature coefficient voltage of the bandgap reference core module, and the adjusted negative temperature coefficient voltage and positive temperature coefficient voltage generated bythe bandgap reference core module overlap to generate a reference voltage. The bandgap reference with the high power supply rejection ratio has the advantages of higher power rejection capability, simple structure, high accuracy and high stability.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to the design of a bandgap reference circuit with high power supply rejection ratio. Background technique [0002] In the design fields of high-performance analog integrated circuits, digital-analog hybrids, digital and power management systems, reference voltage sources are very important and commonly used modules, and are often used in circuits such as analog and digital converters, power converters, and power amplifiers. Performance directly affects the accuracy and stability of the entire system. Since the output of the bandgap reference circuit is connected to the error amplifier or operational amplifier and becomes part of the differential input of the error amplifier, if the power supply ripple or noise cannot be well suppressed in the bandgap reference circuit, then the ripple Voltage and power supply noise will become part of the input signal to the...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a bandgap reference source with a high power supply rejection ratio for the above-mentioned traditional bandgap reference circuit that needs to add additional circuits to improve the power supply voltage rejection ratio, resulting in circuit complexity and increased power consumption. , improve the power supply rejection ratio in the internal circuit of the bandgap reference source, and at the same time the bandgap reference source proposed by the present invention may not use an op amp structure, which avoids the problem of limiting the accuracy of the bandgap reference source due to the introduction of op amp input offset

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