A self-biased bandgap reference source circuit

Abstract

The invention belongs to the technical field of digital-analog hybrid integrated circuits and especially provides a band-gap reference source circuit with a self-bias current source structure inside a power source management chip. The band-gap reference source circuit with the self-bias structure is composed of a positive temperature coefficient circuit module, a negative temperature coefficient circuit module, a compensation circuit module, a computing circuit module, a self-bias structure circuit module, and a computing amplifier unit module. The band-gap reference source is not influenced by Early voltages; the circuit structure is simple; and the integration degree of the circuit structure is higher and stabler. The reference source is insensitive to changes in power source voltages, technological parameters and temperatures; and the reference source can work within a wide power source voltage scope, so that features of low power consumption and reduction of territory area consumption can be achieved.

Description

technical field [0001] The invention belongs to the technical field of digital-analog hybrid integrated circuits, in particular to the improvement of a self-bias structure bandgap reference source in a power management chip, and provides a self-bias structure with a simpler structure, higher integration, and lower power consumption. Bias structure bandgap reference. Background technique [0002] With the vigorous development of domestic integrated circuits, high-efficiency and stable bandgap reference sources are widely used in the design of digital-analog hybrid integrated circuits. The design of the bandgap reference source directly affects the performance of the chip circuit and even the entire system. . For example, on-chip analog-to-digital converters, digital-to-analog converters, comparators, and error amplifiers all require bandgap reference sources to provide accurate and stable reference voltages and reference currents. Therefore, improving the performance of the...

AI Technical Summary

Problems solved by technology

Although it discloses an adjustable voltage reference source that can realize zero temperature coefficient, it lacks its own bias voltage module, and its structure is relatively complicated, and the degree of integration is not high

[0005] The traditional cascode bias structure consumes a large voltage margin, the bias circuit design is complex, and the static power consumption of the circuit structure is additionally increased

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