Design and Implementation of a CMOS Posicast Pre-Shaper For Vibration Reduction of Op-Amps

Posicast-based control is a widely used method in vibration reduction of lightly damped oscillatory systems especially in mechanical fields. In this paper, a fully CMOS Pulse pre-shaper for realization of Posicast command is proposed. Our design is based on delay-and-add approach for the incoming pulses. The delay is done via a modified Schmitt Trigger-like circuit. The adder is implemented by a simple non-binary analog adder terminated by a passive element. Our proposed design has the flexibility in configuration of time delay and amplitude of the desired pulse-like shapes. The delay is controlled via the delay unit and the pre-shaped pulse amplitudes are controlled by analog adder unit. The overall system has 18 MOS transistors, one small capacitor and one resistor. To verify the effectiveness of recommended method, it is experienced on the real CMOS Op-Amps. HSPICE simulation results on 0.25u technology show a significant reduction on overshoot and settling time of the under test OpAmp. The mentioned reduction is more than 95% in overshoot and more than 60% in settling time of system. KeywordsOp-Amp; Posicast; Pre-Shaper; Vibration

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