An All-MOSFET Voltage Reference With −50-dB PSR at 80 MHz for Low-Power SoC Design

This brief presents a voltage reference (VR) for modern low-power system-on-chip applications, in which a high-frequency supply ripple can degrade system performance. With a compact MOSFET low-pass filter, which was developed along with a feedback technique for a wide-bandwidth power supply rejection (PSR), the VR achieves PSR better than 50 dB for frequencies of up to 80 MHz, which was not achieved in previous works. The proposed all-MOSFET VR was fabricated in a standard 0.18-μm CMOS process. It achieves a temperature coefficient of 19 ppm/°C from -30 °C to 80 °C. The line regulation is 0.098%/V for a step from 1.1 to 2.3 V supply voltage with 550-nW power consumption at room temperature and an area of 0.0180 mm2.