Voltage reference with second order curvature correction

Abstract

This paper describes a bandgap voltage reference with second order curvature correction which utilizes a cvasi-independent temperature current and a Buck voltage transfer cell to compensate the non-linear term of the VBE's expression. The proposed circuit is implemented in a 0.35um CMOS technology and achieves a 2.36ppm/ C temperature coefficient (TC) in a temperature range from -40 to 150 C. The nominal supply voltage is 3V and the consumed power is 558uW. The power supply rejection ratio (PSRR) is -50dB at 10kHz and -30dB at 100kHz.