High-Performance Resistorless Sub-1V Bandgap Reference Circuit Based on Piecewise Compensation Technique

A piecewise compensated sub-lV CMOS bandgap reference without using any resistors is presented. The design reduces the silicon chip area with improved circuit robustness. The bandgap reference is simulated with Spectre using SMIC 0.18
μ
m CMOS technology. It operates at a minimum voltage of 1.5 V and generates a stable voltage at 0.658 V with minimal temperature coefficient of ± 5.36 ppm/°C for temperature ranging from -10 to 130°C. It has a line regulation of 0.89% and a high power supply rejection ratio of -42.3 dB. The power consumption of this circuit is as low as 0.229 mA at 1.5 V input voltage.