A bandgap reference circuit utilizing switching to reduce offsets and a novel technique for leakage current compensation

A bandgap reference circuit is presented in a 0.13 /spl mu/m process. Switching techniques are used to eliminate the effects of mismatch in the op amp and current source devices. A novel leakage current compensation technique allows bandgap operation to 200/spl deg/C. The circuit demonstrates a variation of 1.6 mV over 150/spl deg/C and has a temperature coefficient of 13.3 ppm//spl deg/C. A digital control block necessary for the switching technique is also presented.