Abstract: In this work, we present a single-branch voltage reference with outstanding immunity to supply voltage variations. This is achieved by combining a ΔVGS-based core, responsible for temperature compensation, with a multi-loop regulation approach. The latter technique has been adapted to allow seamless operation within a large supply voltage range, down to 0.4 V, while maximum supply immunity is achieved at 0.8 V. Electrical simulations of a 0. 1 8−μm CMOS design demonstrate power-supply rejection as low as -226.6 dB at dc under 0.8-V supply voltage. Power consumption is below 300 pW, and the temperature coefficient is around 20 ppm/ °C between -20 and 80 °C. Performance is robust against random process variations, emulated through Monte Carlo statistical simulations. These findings indicate strong suitability of the proposed circuit for inclusion in low-power microchips subject to low and widely-fluctuating supply voltages.

Keywords: Voltage reference,energy harvesting,temperature coefficient,line sensitivity,PSR,multi-loop regulation 

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