The figure below shows the block diagram of a two-stage SSB modulator. The input signal /...
4.9-3 Design an Armstrong indirect FM modulator in block diagram to generate an FM signal with carrier 96.3 MHz and Af = 20.48 kHz. A narrowband FM generator with fe = 150 kHz and Af = 10 Hz is available. Only a limited number of frequency doublers are available as frequency multipliers. In addition, an oscillator with adjustable frequency from 13 to 14 MHz is also available for mixing, along with bandpass filters of any specification.
Prob. 4 Consider the coherent receiver shown in the diagram below. The input signal is first passed through a mixer before it is demodulated. The frequency of Oscillator I is related to the incoming carrier frequency as fo-f+ fi at all times, where fi is the intermediate frequency. Let the input signal be in the form φ(t) cos 2r/mlt cos 2 πfet, where fe » fm. mo (t) φ(t) BPF 1 Oscillator Oscillator (a) Specify the frequencies present at points...