Research Progress of Bandgap Reference Circuit

Abstract

As an important part of integrated circuit design, bandgap reference circuit is widely used in various chips, among which ADC (analog-to-digital converter) and DAC(digital-to-analog converter) are typical examples. This paper introduces the bandgap reference circuit and its working principle in detail, and then systematically combs and introduces a variety of bandgap reference circuits. A conventional bandgap reference circuit consists of an op-amp, two bipolar transistors and multiple resistors; The CMOS bandgap reference circuit uses the common-source common-gate current mirror to provide the bias current to reduce the power consumption and the channel length modulation effect so that the circuit can work at a lower supply voltage. A bandgap reference circuit using PTAT (proportional to absolute temperature) current to generate reference voltages with different temperature coefficients can produce a simpler circuit structure than the traditional bandgap reference circuit. By summarizing and comparing these bandgap reference circuits, the latest trends and technical trends in this field are presented, providing guidance and inspiration for future research work.