Title：Curvature compensation low-temperature drift band-gap reference voltage source circuit
Country：China
Patent No.：202010130680.4
Legal Status：Authorized
Inventor：Fule Li, Zhe Zhou
Assignee：Tsinghua University
Address：Tsinghua University,Haidian District Beijing 100084, China
Filing Date：2020-02-28
Issue Date：2021-05-14
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.
Patent Certificate：
PDF/Jpg