Low-temperature-drift current source circuit insensitive to power source

Abstract

The invention discloses a low-temperature-drift current source circuit insensitive to a power source. The circuit makes a second MOS pipe always in a normal working state without circuit starting, the voltage influence of the power source on the current going across a second resistor is smaller, correspondingly the influence of power source voltage on the current output by the current source circuit is reduced, and the sensitivity of the current source circuit to the power source is reduced. In addition, in the working process of the current source, threshold voltages of a third MOS pipe and a fourth MOS pipe which are largely influenced by the temperature are mutually offset, accordingly the current going across a third resistor is not influenced by the temperature, the influence of temperature change on the current output by the threshold voltage is thus reduced, and the temperature drift coefficient of the current source circuit is reduced.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a low-temperature drift current source circuit which is insensitive to power supply. Background technique [0002] The current current source circuit is generally a current bias circuit, but at present, when designing a current bias circuit, less consideration is given to power supply sensitivity, low temperature drift coefficient, and circuit reliability, and due to the lack of control in the design process The above considerations often lead to some performance of the current source circuit being affected during use. [0003] In addition, some current bias circuits often need to design a startup circuit in order to provide high-quality current bias. However, due to the existence of the startup circuit, the complexity of the circuit increases, and the risk of abnormal startup also increases. Correspondingly, the current The reliability of the bias circuit is reduced. Contents of the i...

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Problems solved by technology

[0002] The current current source circuit is generally a current bias circuit, but at present, when designing a current bias circuit, less consideration is given to power supply sensitivity, low temperature drift coefficient, and circuit reliability. The above considerations often lead to some performance of the current source circuit being affected during use

[0003] In addition, some current bias circuits often need to design a startup circuit in order to provide high-quality current bias. However, due to the existence of the startup circuit, the complexity of the circuit increases, and the risk of abnormal startup also increases. Correspondingly, the current Reduced reliability of the bias circuit

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