A High-Order Compensated Op-amp-less Bandgap Reference with 39 ppm/ °C over -260~125 °C Temperature Range and -50 dB PSRR

Abstract: This brief presents a technique for compensating the temperature coefficient (TC) of a bandgap reference (BGR) using temperature characteristics of transistor's current gain \b{eta}. As a comparison, three BGR circuits built with Si BJTs and SiGe HBTs are implemented to demonstrate the proposed TC curvature compensation technique. Measured average TC of the HBT proposed BGR is 23ppm/ {\deg}C and 39 ppm/ {\deg}C over the commercial (0~70 {\deg}C) and space (-260~125 {\deg}C) temperature ranges, respectively. With the proposed PSRR improvement technique, the BGR reaches PSRR of -50dB at 1MHz, and -38dB at 1GHz, respectively.