A 3μW, 0.65V regulator with an embedded temperature compensated voltage reference

Abstract

This paper presents a 0.65-V flipped voltage follower (FVF)-based regulator with an embedded sub-1-V voltage reference. A low-pass filter is employed in the current coupling path to reduce the bias noise and improve the power supply rejection (PSR) at a low-frequency band (<;kHz). The chip is fabricated in a 0.18-μm CMOS process and occupies an active area of 0.076 mm2. The proposed FVF regulator achieves a temperature coefficient of 68-ppm/°C over 0-100 °C, with a PSR of -50 dB at 1 kHz, and can drive a 0-3 mA load current while consuming only a quiescent current of 4.5 μA at a 0.8 V supply.