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Square Law modulators are ________(a) used for frequency modulation(b) used for pulse width modulation(c) used for amplitude modulation(d) used for phase modulationThis question was addressed to me at a job interview.My question is taken from Transmitter topic in section Elements of Communication System of Analog Communications

Answer»

The CORRECT choice is (c) used for amplitude modulation

Best explanation: SQUARE LAW MODULATORS are generally used for the generation of amplitude modulated signals. They have nonlinear current-voltage characteristics, such that output current or voltage VARIES as a square of the input.



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