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- For the C.R.O. square voltage waveform shown in Figure determine (a) the periodic time, (b) the frequency and (c) the peak-to-peak voltage. The 'time/cm' (or timebase control) switch is on 100 us/cm and the 'volts/cm' (or signal amplitude control) switch is on 20V/cm.Plot the input and output characteristics curves on two different sheets ...Suggest a demodulator circuit to detect the data signal from the Phase shift keying modulated signal and design it.