Wednesday, August 17, 2011

A.M Modulator Circuit Diagram

Amplitude modulation is a process in which the amplitude of a carrier wave c(t) is varied about a mean value, linearly with the base-band signal m(t).
In amplitude modulation the amplitude of a high-frequency carrier is varied in direct proportion to the low-frequency (base-band) message signal. The carrier is usually a sinusoidal waveform that is,
C(t) = Ac . cos(wt)
Where,  is the carrier amplitude and fc is the carrier frequency.
The base-band signal or message signal is,
m(t) = Am . cos(wt) 
Where, Am is the amplitude of message signal and fm is the frequency of message signal.
An amplitude modulation wave may thus be described in its most general form as the function of the time as follows,
S(t) = m(t)×c(t)

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