HIGH PRECISION, VOLTAGE AND TEMPERATURE COMPENSATED CURRENT SOURCE WITH DIGITAL POSTCORRECTION FOR PROCESS VARIATIONS

Abstract

This paper examines a new technique to reduce the impact of power supply rejection ratio deficiencies in voltage regulators on the performance of current sources that are supplied by these regulators. A voltage regulator with a PMOS output transistor was designed to support 2-mA active load. The technique is relevant for modern 5nm and below technology nodes. SPICE analysis performed over the designed circuit proved the worst case PSRR value as of -35 dB at lower frequencies at wide temperature ranges of -40..125 ° C and supply voltages up to 0.994 V considering the process deviation within ± 4.5 Sigma. Voltage overshoot protection circuit was also developed to ensure safe operation of core devices in various operation modes.