Consider the frequency demodulation scheme in Figure in which the incoming FM signal s (t) is passed through a delay

Question:

Consider the frequency demodulation scheme in Figure in which the incoming FM signal s (t) is passed through a delay line that produces a phase-shift of ?/2 radians at the carrier frequency ?c. The delay-line output is subtracted from the incoming FM signal, and the resulting composite signal is then envelope-detected. This demodulator finds application in demodulating microwave FM signals. Assuming that s (t) = Ac cos (2??ct) + ? sin (2??mt) analyze the operation of this demodulator when the modulation index ? is less then unity and the delay T produced by the delay line is sufficiently small to justify making the approximations cos (2??mT) = 1 and sin (2??mt) = 2??mt

image

This problem has been solved!


Do you need an answer to a question different from the above? Ask your question!

Step by Step Answer:

Related Book For  answer-question
View Solution
Create a free account to access the answer
Cannot find your solution?
Post a FREE question now and get an answer within minutes. * Average response time.
Question Posted: February 10, 2011 06:09:14