A New Low Dropout Regulator with High Power Supply Rejection Ratio

A new low dropout regulator(LDO) is presented,which achieves high power supply rejection ratio(PSRR) for the whole load current range from zero to maximum and high current efficiency via a feedforward transconductance(FT).Designed with chart 0.35μm 5V CMOS process,the worst linear regulation is 633μV/V for the load current ranging from 0mA to 100mA.Post-layout simulation shows that the PSRR is 76dB at 1kHz for load current 10mA.Compared to the presented LDO,the new regulator has high PSRR for much wider load current range.