Synchronous detection of AM signal - Requirements & Disadvantages

Requirements of synchronous detection of AM signal are:

a.) Local generation of carrier
b.) The frequency of the locally generated carrier must be identical to that of transmitted carrier
c.) The phase of the locally generated carrier must be synchronized to that of transmitted carrier
d.) All of the above

Correct Answer: d) All of the above

Explanation:

Synchronous detection of AM signal requires local generation of the carrier signal at the receiver. The frequency of the locally generated carrier must be identical to that of transmitted carrier. And the phase of the locally generated carrier must be synchronized to that of transmitted carrier otherwise the detected signal would get distorted.

Disadvantages of using synchronous detection of AM signal are:

a.) Needs additional system for generation of carrier
b.) Needs additional system for synchronization of carrier
c.) Receiver is complex and costly
d.) All of the above

Correct Answer: d) All of the above

Explanation:

Disadvantages of using synchronous detection of AM signal are that it needs an additional system for generation of carrier. The frequency of the locally generated carrier must be identical to that of transmitted carrier. And the phase of the locally generated carrier must be synchronized to that of transmitted carrier otherwise the detected signal would get distorted so it needs an additional system for synchronization of carrier. This makes the receiver complex and costlier.