The simulation was done using LTspice-IV which
is a free software provided by Linear Technology. SPICE
Behavioral Logic gate(xor) in LTspice-IV [7] is utilized to
simulate the proposed circuit. It is observed that a very sharp
window for the designed window width was obtained as the
simulation result. The input signal simulates a slew of 2V I j..LS
for FigA and 4V/j..Ls for Fig.5 both of which produces sharp
window. The OFF to ON of XOR gate (74ls86) is 30ns [6].
Low cost gates with much faster switching times are available.
But the simulation result shows marked difference in the
window output when these gate are used instead of op-amps.