In the block diagram of a simple modulator for obtaining an AM signal shown in the figure, identify the boxes A and B. Write their functions.
Identification:
A is the square law device.
B is the bandpass filter.
Functions:
Square law device is a non linear device and produces the output. Bandpass filter rejects dc and sinusoidal frequencies,ωm, 2ωm,2ωc and gives the AM wave as its output.
