AM detector circuit functions: What are the main functions of an Amplitude Modulation (AM) detector circuit in a radio receiver?

Introduction / Context:
Demodulation is a fundamental stage in AM radio receivers. The detector circuit extracts the original audio information from the modulated RF signal.

Given Data / Assumptions:

• Modulated input: AM wave containing carrier and sidebands.
• Desired output: audio frequency signal.

Concept / Approach:

An AM detector uses rectification followed by filtering to extract the envelope of the carrier, which corresponds to the audio message signal.

Step-by-Step Solution:

Verification / Alternative check:

Envelope detector operation matches these three steps, confirming that all listed functions are correct.

Why Other Options Are Wrong:

• Each individual option (a, b, c) represents only part of the function; complete answer is all of the above.

Common Pitfalls:

• Assuming detector only rectifies; in fact, it also filters and delivers audio output.

Final Answer:

All of the above.