A 1µA bandgap-less programmable voltage regulator

A voltage regulator architecture implemented with floating-gate transistors is presented. The proposed approach substitutes the traditional bandgap voltage reference circuit and resistive feedback with analog memories. As an additional feature, charge modification of these analog memories allow for output voltage modification and circuit performance improvement after fabrication. Prototypes fabricated in 0.5μm CMOS process (V
_thn
=0.7V; V
_thp
=-0.9V) operate with 1μA of quiescent current and minimum supply of 1.8V. Experimental results show output voltage programmability from 0.6V to 1.4V, maximum load of 0.50mA, line regulation of 13mV/V, load regulation of 80mV/mA, and a maximum temperature coefficient of 58.2ppm/°C.