A fully differential op-amp topology with improved PSRR and CMRR

Power supply rejection ratio (PSRR) is an extremely important quality figure for operation amplifiers (op-amps). Especially in mixed analog-digital ICs, the analog circuit must be able to discriminate against the digital noise coupled through the power supply lines. The authors address the analysis and simulation of PSRR of fully differential op-amps. It is shown that the PSRR of a fully differential circuit is affected by circuit asymmetry resulting from manufacturing variations. Analysis and Monte-Carlo simulations are shown for a novel high slew-rate fully-differential folded cascode op-amp.<
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