Lect-8-FM_07 - Lecture 8 Frequency Modulation FM Generation...

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Unformatted text preview: Lecture 8 Frequency Modulation FM Generation FM Generation 1.Direct Method 2.Indirect Method (Armstrong Method) Narrowband FM Generation (NBFM) Wideband FM Generation Combination of NBFM and Frequency multipliers Narrow Band FM: )] ( cos[ ) ( t t c c A t FM x + = ] sin cos[ t m t c c A + = ) sin sin( sin ) sin cos( cos t m t c c A t m t c c A - = is very small, so 1 2245 ) sin cos( t m t m t m sin ) sin sin( 2245 t m t c c A t c c A sin sin cos- = Integrator sin m t- A c cos c t-/ 2 + NBFM ] ) cos( ) [cos( 2 cos ) ( t m c t m c c A t c c A t NBFM x -- + + = ] ) cos( ) [cos( 2 cos ) ( t m c t m c c A t c c A t AM x - + + + = NBFM requires same transmission bandwidth as AM i.e., 2f m . is around 0.2 to 0.3 Wide Band FM generation: NBFM generator Frequency Multiplier Wide Band FM Signal Integrator NBFM Crystal oscillator Frequency Multiplier Mixer Local Oscillator Frequency Multiplier FM Signal Wide Band FM Generation:...
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Lect-8-FM_07 - Lecture 8 Frequency Modulation FM Generation...

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