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Question

Given below is the circuit digram of an AM demodulator
For good demodulation of AM singal of carrier frequency f, the value of RC should be :
       

Options

A.RC = 1/f
B.RC < 1/f
C.RC ≥ 1/f
D.RC >> 1/f

Solution

In demodulation, high frequency carrier wave is filtered out to get signal wave. For it we use capacitance in parallel which absorbs high frequency component of the import modulated signal. So reactance of C should be small
or << R or ≤ R
RC >>

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