Band gap reference circuit

Abstract

The invention provides a band gap reference circuit at least comprising the following elements: a band gap reference module generating voltage independent of temperature, wherein the band gap reference module comprises a base electrode drive unit used for generating negative temperature coefficient voltage and positive temperature coefficient voltage according to triode temperature characteristics; an operational amplification unit used for detecting the voltage outputted by two output ends of the base electrode drive unit, and equalizing the voltage outputted by two output ends of the base electrode drive unit according to feedbacks, so the base electrode drive unit can generate the negative temperature coefficient voltage and positive temperature coefficient voltage; an output buffer module connected with the band gap reference module and used for outputting the reference voltage. The band gap reference circuit is high in output voltage precision, small in temperature coefficient influence, suitable for low power supply voltage, and a start circuit and output buffer level circuit are simple in structure.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a bandgap reference circuit. Background technique [0002] Bandgap reference circuits are widely used in the design of analog integrated circuits and can provide high-precision, high-stability reference voltages. The reference voltage has little correlation with the power supply, process parameters and temperature. The accuracy of the reference voltage, temperature stability and the ability to resist noise interference directly affect the accuracy and performance of the entire circuit system. Therefore, it is important to design a high-performance reference voltage source. significance. With the maturity of analog integrated circuit design, many bandgap reference circuit structures have been developed. These circuits all seek compromises among many factors such as voltage accuracy, voltage temperature coefficient, circuit complexity, and occupied chip area. However, exis...

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Problems solved by technology

[0011] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a bandgap reference circuit, which is used to solve the problems in the prior art that the voltage accuracy and temperature coefficient are not optimized enough, the circuit is complicated, and it is not suitable for low power supply voltage operation.

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