A 16.28 ppm/°C Temperature Coefficient, 0.5V Low-Voltage CMOS Voltage Reference with Curvature Compensation

Abstract: This paper presents a fully-integrated CMOS voltage reference designed in a 90 nm process node using low voltage threshold (LVT) transistor models. The voltage reference leverages subthreshold operation and near-weak inversion characteristics, backed by an all-region MOSFET model. The proposed design achieves a very low operating supply voltage of 0.5 V and a remarkably low temperature coefficient of 16.28 ppm/{\deg}C through the mutual compensation of CTAT, PTAT, and curvature-correction currents, over a wide range from -40 {\deg}C to 130 {\deg}C. A stable reference voltage of 205 mV is generated with a line sensitivity of 1.65 %/V and a power supply rejection ratio (PSRR) of -50 dB at 10 kHz. The circuit achieves all these parameters while maintaining a good power efficiency, consuming only 0.67 {\mu}W.