A 0.7-V and 10-nA CMOS-Only Voltage Reference with 1-mA Load Driving Capability Based on Gate-Voltage Compensation Loop

An ultra-low quiescent current CMOS-only voltage reference with load driving capability has been proposed and simulated in a standard 0.18 μm CMOS process in this paper. A gate-voltage compensation loop is used to achieve load driving capability without using an output buffer. In addition, a stacked diode-connected MOS transistor structure has been introduced to reduce the quiescent current as low as 10 nA and achieve process independence. Lastly, based on the CMOS-only structure, the proposed circuit can allow for a load current as high as 1 mA at 0.7 V. The proposed circuit achieves a temperature coefficient of 33.09 ppm/°C within a range from -20°C to 140°C. Besides, a line sensitivity of 0.177%/V and a power supply rejection ratio of -63 dB at 5 Hz are obtained.