A 12.8 nA and 7.2 ppm/°C CMOS voltage reference without amplifier

Abstract

Based on the negative feedback technique, an ultra-low-power CMOS voltage reference without amplifier is proposed using a 0.18 µm CMOS technology. The proposed voltage reference achieves a temperature coefficient (TC) of 7.2 ppm/°C when the temperature ranges from −20 °C to 80 °C, only consuming 12.8-nA current at room temperature. Besides, the minimum supply voltage is 0.75 V and line sensitivity (LS) is 0.24 mV/V when supply voltage ranges from 0.75 V to 3.5 V. The power supply rejection ratio (PSRR) is only −79 dB at 100 Hz, −56 dB at 1 MHz, respectively.