A high precision CMOS bandgap reference with second-order curvature-compensation

A high precision bandgap reference circuit with second-order curvature-compensation to improve the temperature coefficient in wider temperature range is presented in this paper. Simulation results with CSMC 0.6 mum 2P2M CMOS process model show that, the design features a reference voltage of 1.255 V at 25degC. The temperature coefficient is less than 5.29 ppm/degC at the range of -35-120 degC. With supply voltage variation of 2-5 V, the line-regulation ratio is 110 muV/V And PSRR is -81.54 dB. The active area of layout is 300 mum times 400 mum. Test results based on 20 samples show a good agreement with the simulation results.