A bandgap reference circuit with temperature compensation

Abstract

These After analyzing the basic principle of bandgap reference(BGR), a differential pair of npn transistors with an emitter area ratio are used to produce a current which is proportional to absolute temperature (PTAT) in this paper. A relatively simple current compensation methods is illustrated to optimize the temperature characteristic of the BGR. This BGR has been verified in 0. 8um BiCMOS process library and achieves a temperature coefficient (TC) of 5. 98ppm/ °C with a temperature range from -50 °C to 150 °C at 5V power supply, the variation in the output of BGR is less than 1. 7mV with a power supply range from 3V to 10V, and a lower power dissipation.