一种低温漂低功耗的带隙基准电压源设计OA北大核心CSTPCD

To enhance the performance of DC-DC converters,a voltage bandgap reference was proposed.The first-order temperature dependence of the current in two sides were offset by adjusting parameters,resulting in current with only a constant term and high-order temperature dependent terms.As a result,the output resistance is compensated by the high-order temperature dependent terms of the transistor,which yields a lower temperature coefficient of the bandgap.An RC filter was added at the output to enhance the power supply rejection ratio in the high-frequency range.Additionally,almost all MOS transistors were placed in the subthreshold region to explore the characteristics of the bandgap at low power consumption and achieve a reduction in static current.The circuit design and simulation were completed based on the TSMC 0.18 μm CMOS process.The results show that the bandgap output is 1.256 V at a supply voltage of 1.8 V.From-40 ℃ to 140 ℃,the temperature coefficient is 6.3x 10-6℃-1.By adding an RC filter,the power supply rejection ratio is-65 dB@10 MHz at high frequency.Moreover,the static current of the entire bandgap is only 6.2 μA.