Question

The message m(t) = 5 cos(2?1000t) is frequency-modulated to 90MHz, with kf=2000?.

Determine the frequency deviation and deviation ratio of the FM signal. Also estimate the bandwidth of the FM signal.

Suppose now you are provided with a crystal oscillatorat 90MHz, an analog multiplier, and a second-order loop filter, and a VCO. Explain by drawing a block diagram how the FM signal can be demodulated using these components. Specify the minimum required operation range of the VCO.

Answer 1