This paper introduces a low-temperature drift and high power supply rejection ratio bandgap reference circuit based on CSMC0.5 μm process. Based on the original Banba bandgap reference circuit, this paper adopts a common source and common gate current mirror structure and introduces a negative feedback loop to greatly improve the power supply rejection ratio of the overall circuit. The Spectre simulation analysis results show that within the temperature range of -40~100 ℃, the output voltage swing is only 1.7 mV, and the power supply rejection ratio (PSRR) reaches more than 100 dB at low frequency. The power consumption of the entire circuit is only 30 μA. It can be well applied in the design of low-power and high power supply rejection ratio LDO chips.
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