Curvature compensation low-temperature drift band-gap reference voltage source circuit

Abstract

The embodiment of the invention provides a curvature compensation low-temperature drift band-gap reference voltage source circuit. The curvature compensation low-temperature drift band-gap reference voltage source circuit is used for generating a reference voltage, and comprises a starting circuit, a first-order reference circuit and a high-order curvature compensation circuit; the starting circuit is used for providing starting voltage for a voltage reference source circuit so as to prevent the voltage reference source circuit from working in a zero state region, the first-order reference circuit is used for generating low-temperature coefficient reference voltage, and the high-order curvature compensation circuit is used for performing high-order temperature curvature compensation on thefirst-order reference circuit. According to the technical scheme, influence of input offset voltage and noise of an operational amplifier is effectively reduced in a multi-stage PNP superposition mode, and meanwhile, a high-order curvature compensation method is provided for the multi-stage PNP superposition band-gap reference source circuit, so that the temperature drift coefficient of the band-gap reference source is effectively reduced.

Description

technical field [0001] The present application relates to a reference voltage source circuit, in particular to a curvature compensation low-temperature drift bandgap reference voltage source circuit. Background technique [0002] With the continuous advancement of integrated circuit technology, bandgap reference sources are more and more widely used in various electronic systems, such as temperature sensors, power regulators, digital-to-analog converters, analog-to-digital converters, and memory circuits. With the continuous upgrading of technology, the system's requirements for various performance indicators of the bandgap reference are also increasing. The bandgap reference provides a reference voltage for the entire system, and its performance will directly affect the performance of the entire system. Therefore, the output reference voltage is required to have a lower temperature coefficient and higher precision, that is, the circuit distribution range is relatively smal...

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Problems solved by technology

[0005] However, this circuit has the following disadvantages: 1. In the bandgap reference core circuit, the mismatch between the input transistors of the op amp will cause the input offset voltage of the op amp, resulting in V A , V B The voltages at two points are not exactly equal, and this offset voltage, after a certain proportional gain, will affect V ref The value of V has a certain influence, causing V ref The voltage is

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