Band-gap reference voltage source with curvature compensation function

Abstract

The invention discloses a band-gap reference voltage source with the curvature compensation function. The band-gap reference voltage source with the curvature compensation function comprises a one-order temperature compensation circuit, a curvature compensation circuit and a band-gap reference voltage generating circuit, wherein the one-order temperature compensation circuit is used for generating same-order current irrelevant to temperature, the curvature compensation circuit is used for generating current with a high-order temperature characteristic and superimposing the current with the high-order temperature characteristic and the same-order current irrelevant to temperature so that the current irrelevant to temperature can be generated, the band-gap reference voltage generating circuit is used for transmitting the current irrelevant to temperature to the output end and converting the current into voltage, the one-order temperature compensation circuit is connected with the curvature compensation circuit, and the curvature compensation circuit is connected with the band-gap reference voltage generating circuit, and the one-order temperature compensation circuit, the curvature compensation circuit and the band-gap reference voltage generating circuit jointly form the band-gap reference voltage source. Through the band-gap reference voltage source, the accuracy of compensating current can be effectively improved, the temperature drift coefficient of output reference voltage is reduced, and therefore the temperature stability of the output reference voltage can be improved.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a bandgap reference voltage source with curvature compensation. Background technique [0002] Generally speaking, the power supply voltage input to the integrated circuit chip has certain fluctuations, and the high-precision analog circuit also requires high stability of the bias voltage. Therefore, we generally use a reference voltage source in the analog circuit , it can convert the power supply voltage into a voltage with good voltage stability and temperature stability, and provide a good reference voltage for other parts of the circuit. [0003] The reference voltage source usually refers to a very accurate and stable voltage source used as a voltage reference in the circuit. With the continuous increase of the scale of integrated circuits, especially the development of system integration technology, the reference voltage source has become an indispensable basic circ...

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Problems solved by technology

But due to VBE The temperature coefficient of also contains nonlinear part, and △V BE The temperature characteristic merely offsets the V BE Therefore, in the actual working environment, the bandgap reference voltage source of the prior art cannot effectively compensate the reference voltage, and cannot meet the requirements of high-precision analog circuits and digital-analog hybrid circuits for the reference voltage. Require

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