A CMOS bandgap reference circuit for sub-1-V operation without using extra low-threshold-voltage device

Abstract

A new sub-1-V CMOS bandgap voltage reference without using low-threshold-voltage device is presented in this paper. The new proposed sub-1-V bandgap reference with startup circuit has been successfully verified in a standard 0.25-mu n CMOS process, where the occupied silicon area is only 177 pm x 106 pm. The experimental results have shown that, with the minimum supply voltage of 0.85 V, the output reference voltage is 238.2 mV at room temperature, and the temperature coefficient is 58.1 ppm/degrees C from - 10 degrees C to 120 degrees C without laser trimming. Under the supply voltage of 0.85 V, the average power supply rejection ratio (PSRR) is -33.2dB at 10 kHz.