Abstract: A novel high-performance curvature-compensated CMOS bandgap reference is presented. Instead of Differential-Amps used in typical structures, the negative feedback technique is used to clamp node voltages, thus simplifying the design. A regulated cascade configuration is used to improve the power supply rejection ratio (PSRR). The entire circuit is implemented in SMIC standard 0.18μm CMOS process. Results from HSPICE simulation show that the temperature coefficient between -45℃～125℃ is 12.9×10^-6／℃, and that the PSRR is 67.2dB at 10Hz. The design can be applied to high-speed analog-to-digital converters.

Key words: negative feedback clamp, bandgap voltage reference, high-temperature stability