A Low Power and High Power Supply Rejection Ratio Voltage Reference Based on Subthreshold

To solve the problem of high power consumption and low power supply rejection ratio(PSRR) in traditional bandgap reference, a subthreshold reference voltage source for low power consumption, high PSRR and wide power supply voltage range is presented in this paper, applying for systems such as energy harvesting and wireless sensor networks, etc. The reference enhances the PSRR and linearity regulation of the voltage source through the Asymmetric Self-Cascode current mirror andnegative feedback. Designed in the Global Foundry 0.18 μm BCD process, the simulation results show that the reference circuit is able to operate under a supply voltage range of 2.7~5.5 V, the output reference voltage is 1.2 V and the lowest power consumption is 446.2 nW. Under 3.3 V power supply voltage, the temperature coefficient is 30.3 ppm in a temperature range from -40℃ to 125℃. The linear adjustment rate at room temperature is 0.013%/V. The PSRR is -75 dB at 100 Hz frequency.