A Low Voltage High PSRR Reference Source Based on Regulated Current Mode Structure

A new bandgap voltage reference circuit with low voltage,high power supply rejection ratio(PSRR) based on a regulated current mode structure is presented.The proposed circuit utilizes a regulated current mode structure and some feedback loops to improve the overall PSRR.Using resistive subdivision reaches a low voltage and provides the bias voltage of transistors,simplified bias circuit.The circuit was designed with 0.5μm complementary metal oxide semiconductor transistor(CMOS) N-well technology,which worked at 1.5V power voltage.Cadence Spectre simulation results show PSRR is 107dB at low frequencies,the temperature coefficient from-10℃ to 125℃ temperature range is 7.17 ppm/℃ and the power consumption is only 0.525mW.This circuit shows robustness against process variation.