Sep 18, 2017

ASSUME THAT PROB. 5–6 DESCRIBES THE OPERATION OF AN AM TRANSMITTER AND ITS MODULATING WAVEFORM,

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Assume that Prob. 5–6 describes the operation of an AM transmitter and its modulating waveform, except that a four-quadrant multiplier is used. Let  Using MATLAB, plot the voltage waveform that appears at the output of this transmitter.

Prob. 5–6

An AM transmitter uses a two-quadrant multiplier so that the transmitted signal is described by Eq. (5–7). Assume that the transmitter is modulated by m(t) = Am cos ωmt, where Am is adjusted so that 120% positive modulation is obtained. Evaluate the spectrum of this AM signal in terms of Ac, fc, and fm. Sketch your result.

Eq. (5–7)


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