A 2-V 23-μA 5.3-ppm/°C curvature-compensated CMOS bandgap voltage reference

A high-order curvature-compensated CMOS bandgap reference, which utilizes a temperature.-dependent resistor ratio generated by a high-resistive poly resistor and a diffusion resistor, is presented in this paper. Implemented in a standard 0.6-mum CMOS technology with V-thn approximate to \V-thp\ approximate to 0.9 V at 0 degreesC, the proposed voltage reference can. operate down to a 2-V supply and consumes a maximum supply current of 23 muA. A temperature coefficient of 5.3 ppm/degreesC at a 2-V supply and a line regulation of +/-1.43m-V/V at 27degreesC are achieved. Experimental results show that the temperature drift is reduced by approximately five times when compared with a conventional bandgap reference in the same technology.