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

摘要

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 nm CMOS has been developed and occupies 0.0039 mm(2), and at room temperature, it generates a 204 mV reference voltage with 1.3 mV drift over a wide temperature range (from -40 degrees C to 125 degrees C). This has been designed to operate with a power supply voltage down to 0.6 V and consumes 1.8 uA current from the supply. The simulated temperature coefficient is 40 ppm/degrees C.