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Square Law modulators ________

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Square Law modulators ________

(a) used for amplitude modulation

(b) have non linear current-voltage characteristics

(c) have non linear current-voltage characteristics as well as used for Amplitude Modulation

(d) used for frequency modulation

The question was asked in class test.

My question is taken from Frequency Domain Description in chapter Amplitude Modulation of Analog Communications

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Right choice is (c) have non linear current-voltage characteristics as well as used for Amplitude Modulation

Easiest explanation: Square law modulators are used for amplitude modulation and have non-linear current-voltage characteristics. The output of Square law demodulator is said to vary with respect to square of the input. They are highly linear in low voltage region.

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