# Exercise 7: R t Envelope Detector y(0 The circuit in the figure above is a good approximation to ...

###### Question:

Exercise 7: R t Envelope Detector y(0 The circuit in the figure above is a good approximation to an ideal differentiator demodulator if С 0.1 h, where fe is the carrier frequency of the FM signal and fr is the cut-off frequency of the RC high-pass filter. The input FM signal is given by the following. DrM(t) 4 cos[10 nt + 10 T (5 sin(10 mt))] a) b) Specify the value of the resistance R such that fe-0.1 h, when C Give an expression for the output signal of the demodulator, where 5 pF.

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