A Resistorless High-Precision Compensated CMOS Bandgap Voltage Reference

Abstract

A resistorless high-precision compensated CMOS bandgap voltage reference (BGR), which is compatible with a standard CMOS process, is presented in this paper. A higherorder curvature correction method called base-emitter voltage linearization is adapted to directly compensate the thermal nonlinearity of base-emitter voltage. With proper mathematical operations of high-order temperature currents, most of the nonlinear temperature terms in VBE can be greatly eliminated. The proposed BGR, which is implemented in 0.35-μm CMOS technology, is capable of working down to 2 V supply voltages with 1.14055 V mean output voltage. A minimum temperature coefficient of 1.01 ppm/°C with a temperature range from -40 °C to 125 °C is realized, and a power-supply noise attenuation of 61 dB is achieved without any filter capacitors. The line regulation is better than 2 mV/V from 2 V to 5 V supply voltage while dissipating a maximum supply current of 33 μA. The active area of the presented BGR is 180 μm × 220 μm.