A 0.6 V MOS-Only Voltage Reference for Biomedical Applications with 40 ppm/∘C Temperature Drift

Abstract

This paper exploits the CMOS beta multiplier circuit to synthesize a temperature-independent voltage reference suitable for low voltage and ultra-low power biomedical applications. The technique presented here uses only MOS transistors to generate Proportional To Absolute Temperature (PTAT) and Complimentary To Absolute Temperature (CTAT) currents. A self-biasing technique has been used to minimize the temperature and power supply dependency. A prototype in 65[Formula: see text]nm CMOS has been developed and occupies 0.0039[Formula: see text]mm2, and at room temperature, it generates a 204[Formula: see text]mV reference voltage with 1.3[Formula: see text]mV drift over a wide temperature range (from [Formula: see text]40[Formula: see text]C to 125[Formula: see text]C). This has been designed to operate with a power supply voltage down to 0.6[Formula: see text]V and consumes 1.8[Formula: see text]uA current from the supply. The simulated temperature coefficient is 40[Formula: see text]ppm/[Formula: see text]C.