An improved bandgap reference with high power supply rejection

An improved bandgap reference with high power supply rejection (PSR) is presented. The proposed circuit consists of a simple voltage subtractor circuit incorporated into the conventional Brokaw bandgap reference. Essentially, the subtractor feeds the supply noise directly into the feedback loop of the bandgap circuit which could help to suppress supply noise. The simulation results have been shown to conform well with the theoretical evaluation. The proposed circuit has also shown robust performance across temperature and process variations.