New Curvature-Compensated CMOS Bandgap Voltage Reference

摘要

A novel curvature-compensated CMOS bandgap voltage reference is presented. The reference utilizes two first order temperature compensations generated from the nonlinearity of the finite current gain β of vertical pnp bipolar transistor. The proposed circuit, designed in a standard 0.18 μm CMOS process, achieves a good temperature coefficient of 2.44 ppm/°C with tempera- ture range from -40 °C to 85 °C, and about 4 mV supply voltage variation in the range from 1.4 V to 2.4 V. With a 1.8 V supply voltage, the power supply rejection ratio is -56 dB at 10 MHz.