A compact low-noise fully differential bandgap voltage reference with intrinsic noise filtering

A new architecture for differential bandgap voltage references is presented. The system is based on a switched capacitor amplifier that performs correlated double sampling to cancel offset and reduce flicker noise while maintaining a valid output voltage throughout the clock cycle. The circuit noise is filtered by an intrinsic discrete time low-pass function with tunable cut-off frequency. A prototype designed with 0.18 um CMOS process is described. Preliminary performances are estimated by means of periodic noise analysis carried out with the SpectreRF simulator.