A 1.33 ppm/°C Precision Bandgap Reference with Piecewise-Linear Curvature Compensation

This paper presents a high-precision bandgap reference with a piecewise-linear curvature-compensation (PCC) circuit that produces a low temperature coefficient (TC). The proposed PCC compensation circuit uses six transistors to generate a piecewise-linear temperature voltage to reduce reference voltage variation within a wide range of temperatures. The proposed bandgap reference was designed using standard TSMC 0.18-μm 1P6M CMOS technology. Simulation results indicate that the proposed bandgap reference achieves a TC of 1.33 ppm/°C from -40°C to 140°C with a supply voltage of 1.8 V. The output voltage variation of the proposed circuit improved markedly from 1.13 to 0.24 mV over a temperature range of -40°C to 140°C.