A 0.9-V high-PSRR bandgap with self-cascode current mirror

Abstract

A 0.9-V supply voltage, high power supply rejection ratio (high-PSRR) bandgap reference with high-order compensation is presented. By inserting a group of self-cascode current mirrors and adopting an effective technique of high-order compensation, this bandgap reference is designed in 0.18 μm CMOS process. Simulation has been carried out and the results prove that the PSRR and temperature coefficient (TC) are both improved evidently in low voltage. Under 0.9 V supply voltage, the bandgap reference's PSRR is -86 dB at 1 kHz and -25 dB at 1 MHz, its TC is 0.096 ppm/°C from -40 °C to +85 °C, consuming a total current of 86.6 μA.