Techniques for demodulation of AM

Q.  AM demodulation techniques are
- Published on 13 Oct 15

a. Square law demodulator
b. Envelope detector
c. PLL detector
d. Both a and b are correct

ANSWER: Both a and b are correct
 
AM signals are detected or demodulated using Square law demodulator or envelope detector. The demodulators extract the information from the received AM signal.

Square law demodulators are highly nonlinear in low voltage region so they are used for low level modulated signals. Envelope detectors extract the envelope of the AM wave.

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