22-03-2014, 10:18 AM
Modulation
Aim:
To study the (a) Amplitude Modulation and demodulation of a sine wave signal (b)
Pulse Width Modulation and demodulation of a square wave signal.
Procedure:
1) Make the circuit as shown in Fig. 10.1. Trace the modulated output and calculate the
percent of modulation.
2) For the pulse width modulation, make the circuit as shown in Fig. 10.2. Adjust the
carrier and signal inputs to generate a pulse width modulated signal of frequency 1kHz,
20kHz and 50 kHz and duty cycle of 40%. Trace the modulated signal, note the
frequencies of the input signals.
Try Out:
1) Design the demodulation circuit for pulse width modulation.
2) Design the circuit for frequency modulation.