A 77-nA and Three-Output CMOS Voltage Reference with -73dB PSRR for Energy Harvesting Systems

A CMOS-only and multiple-output voltage reference has been proposed and simulated in a standard 0.18 μm CMOS process in this paper. Three reference voltages with their own advantages simultaneously are obtained based on the body bias technology and specific active load. Among the three references, the best temperature coefficient (TC) of 74.8ppm/°C in the range from -20°C to 80°C is obtained without using resistors and specific devices. By introducing amplifier and pushing away the main pole of the circuit, low line sensitivity (LS) of 0.06%/V and high power supply rejection ratio (PSRR) of -73dB at 10Hz are obtained without capacitor. Besides, due to the subthreshold operation, the current is as low as 77nA with a supply voltage down-to 1V.