ABSTRACT
The FM receiver also uses the superheterodyne principle and is quite similar to AM receiver. The FM receivers are used for sound broadcasting, TV, police, radio, and military systems. A low noise mixer is used, where as colpitt configuration is used as local oscillator. The process of extracting the original signal from a FM wave is known as frequency demodulation and the circuits that perform this job are called demodulators or detectors. The Foster seeley and ratio detectors both belong to the category of “Quadrature Detectors”. The FM receiver receives the FM signal coming from FM transmitter and then recovers the original modulating signal. The FM demodulator is a bit different from the AM demodulator.
