A multi-valued 350nm CMOS voltage reference

This paper describes, a voltage reference source using sub-threshold MOSFETs. The circuit supports supply voltages ranging from 1.5V to 3.3V and temperature variations ranging from -20°C to 80°C. Different values for the voltage reference can be achieved without severe performance impairments. The proposed circuit was produced in the 350nm CMOS process from AMS and occupies less than 0.0335mm². Simulation and experimental data show that this circuit is able to achieve, a 3mV variation for the entire temperature span and a 2mV variation for the entire supply voltage span.