Improvement of timing specifications in second order electronic systems using programmable CMOS Posicast pulse shapers

In this research we present a new programmable pulse pre-shaper to efficiently reduce the overshoot of second order electric and electronic systems. In the proposed design, the input step pulse is passed from the delayed unit. The delay unit changes the arrival time of input pulse with different controlled digital input lines values for rising and falling edges. Then the resulted delayed pulse is added with the original step pulse with analog adder circuit to prepare the final Posicast signal. In the proposed circuit the voltage levels are controlled with two other input code words. The proposed design is simulated and all the simulations are prepared using 0.18u CMOS technology with HSPICE. Our experimental results show that, the proposed delay and adder circuits work linearly respects to the code word. To show the correctness and effectiveness of the proposed circuit, the Posicast pulse is applied on a real CMOS Op-Amp. The Simulation results show a significant reduction on the overshoot and settling time.