1.

Given below a circuit diagram of an AM demodulator. For good demodulation of AM signal of carrier frequency f, the value of RC should be:

Answer»

`RC=(1)/(f)`
`RClt(1)/(f)`
`RCge(1)/(f)`
`RCGT GT(1)/(f)`

Solution :From the MODULATED signal, we can demodulate or detect the MODULATING or message signal by using a diode and suitable capacitor filter. The `AM` signal given to the INPUT of the circuit appears at output of the diode as a rectified wave as shown

For good demodulation of `AM` signal the value of `RC` (which is a time-constant) is chosen such that
`(1)/(F) lt lt R C` or `R C gt gt (1)/(f)`
where `f` is the frequency of the carrier signal.


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