21-05-2013, 04:02 PM
DSB-SC MODULATION AND DEMODULATION
Aim:
To generate AM-Double Side Band Suppressed Carrier (DSB-SC) signal.
Theory:
Balanced modulator is used for generating DSB-SC signal. A balanced modulator consists of two standard amplitude modulators arranged in a balanced configuration so as to suppress the carrier wave. The two modulators are identical except the reversal of sign of the modulating signal applied to them.
Procedure:
1. Connect the circuit diagram as shown in Fig.1.
2. An Carrier signal of 1 Vp-p amplitude and frequency of 83 KHz is applied as carrier to pin no.10
3. An AF signal of 0.5 Vp-p amplitude and frequency of 5KHz is given as message signal to pin no.1
4. Observe the DSB-SC waveform at pin no.12.