A bandgap voltage reference with high PSRR and low temperature drift at the all process corners

A bandgap voltage reference circuit which has high PSRR and low temperature drift at all Process Corners was presented based on SMIC's 0.35 μm CMOS process.First,a high PSRR voltage reference is amplified by a voltage amplifier to get a stabilized voltage,which then is provided to bandgap core as power supply,so as to get high PSRR.Besides,set the key resistor tunable to adjust the positive voltage temperature coefficient,so as to meeting the negative voltage temperature coefficient change under different processes,and ultimately getting a bandgap voltage reference with low temperature coefficient at all processes.Cadence virtuoso simulation results showed that the circuit had a PSRR-109 dB(10 Hz)and-64 dB(10 kHz) at 27 ℃ and a temperature coefficient below 3.2×10-6/℃ at all processes under 4 V supply voltage from-40～80 ℃.