A low quiescent current LDO voltage regulator for passive RFID transponder-tags using SMCNR-compensation

CMOS (Complementary Metal Oxide Semiconductor) analog circuit design for passive RFID transponder systems requires significant decrement of power consumption for almost every system component. The following work presents a low quiescent current voltage regulator providing a precise power supply for sensitive system components such as temperature sensors and analog-digital-converters. Primary purpose during the design process is to minimize the overall power consumption and guaranteeing system stability for any operating condition. The regulator output voltage remains constant at 1:55 V with a varying input voltage from 1:6V to 3:6V. All occurring interferences on the input voltage are damped by at least 40 dB to the regulator output. The overall regulator current consumption is 430 nA for the highest, and 360 nA for the lowest input voltage.