A Novel Dynamic Current Boosting Technique for Enhancement of Settling Time and Elimination of Slewing of CMOS Amplifiers

A very simple technique to achieve low settling time is presented. It is based on the combination of class AB differential input stages, local common-mode feedback (LCMFB), and clamping circuit which provides additional current boosting, keeping the gain-bandwidth product (GBW) nearly constant. The slew enhancement is provided by an auxiliary circuit which is activated only during transients. The design is based on the “TSMC 180nm CMOS technology”.