A Piecewise-Line Compensated CMOS Bandgap Reference

This paper presents a positive-negative temperature coefficient current generator, which is added to a traditional current mode reference circuit, so that Piecewise-Linear temperature Compensated technique can be used to improve the temperature drift of CMOS bandgap reference circuit within wider temperature range.The proposed circuit is designed by 0.18μm CMOS mix-signal technology.Under the supply voltage of 1.8V, the proposed bandgap reference provides an output voltage of is 0.801V.A temperature coefficient of 2.7ppm / ℃ from-40 ℃ to125 ℃ can be achieved, and line regulation of 1.2 mV/V from1.5V to3.3V.