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Cross-Modulation

October 16th Fact-of-the-Day

Cross-modulation is a condition where the amplitude of a signal of one frequency is affected by the amplitude of another signal of a different frequency. Where one of the signals is amplitude modulated (AM, SSB, etc.), cross-modulation results in the instantaneous envelope amplitude of the other signal depending on the instantaneous envelope amplitude of the modulated signal. By this means the modulation of the first signal is transferred to the second signal. This phenomenon is not limited to two signals. Any number of signals can cross-modulate each other. Cross-modulation occurs in circuits that have non-linear amplitude responses, including both diode and amplifier circuits as a result of third-order actions. ©2004 Martek International All rights reserved.


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