A multi-output supply-independent voltage reference in standard CMOS process for telemetry-powering applications

Abstract

In this paper, a multi-output voltage reference circuit is introduced in standard CMOS process. It exhibits extremely low supply independency for wide input voltage range, which makes it suitable for telemetry-powered systems. This circuit is based on the well-known VGS-reference supply-independent current reference circuit, but it is designed to serve as a voltage reference. While the reference current generated by this circuit varies with the supply voltage, a self-compensating mechanism can be fond in voltage-mode operation of the circuit that results in a supply-independent reference voltage. This supply independency is well observed in the static operation of the circuit overran extremely wide input range, and also in its dynamic behavior for high frequency ripples on the input voltage. The proposed voltage reference circuit has been fabricated sing MOSIS 1.6 mm standard CMOS process. The basic voltage reference provides 1.33mV/V static supply dependency, rejects input ripples of up to 1MHz by 48dB, when the input voltage varies in the range 6-14V.