FM Generation The FM modulator circuits used for generating FM signals can be divided into two categories such as: (i) The direct method or parameter variation method (ii) The Indirect method or the Armstrong method The classification of FM generation methods is shown below : The Direct Method or Parameter Variation Method In direct method or parameter variation method, the baseband or modulating signal directly modulates the carrier. The carrier signal is generated with the help of an oscillator circuit. This oscillator circuit uses a parallel tuned L-C circuit. Thus the frequency of oscillation of the carrier generation is governed
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