A CMOS bandgap reference for differential signal processing

Abstract

A switched-capacitor fully differential bandgap reference that uses a standard double-poly CMOS process is presented. It generates a differential reference voltage of 6.2 V with a standard deviation of about 24 mV and a typical temperature stability of 15.2 p.p.m./ degrees C over an extended temperature range from -40 to +85 degrees C. These performance results are obtained without using any trimming in mass production. The bandgap reference only occupies 730 mil/sup 2/ and dissipates 4.8 mW at+or-5-V power supplies. A measured power supply rejection of about 90 dB until 500 kHz is the best ever reported at high frequency.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>