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A major characteristic property required by frequency multipliers for frequency multiplication to happen is:

A major characteristic property required by frequency multipliers for frequency multiplication to happen is: Correct Answer Non linearity

Non linearity property of devices like transistors and diodes is exploited in frequency multipliers. In transistor amplifiers, FET are used since several nonlinearities exist in FET can be used for harmonic generation.

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P- And if I think about something which didn't happen I start thinking about all the other things which didn't happen.
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The major drawback of frequency multipliers is that they have:
If a frequency multiplier has a multiplication factor of 10, then the increase in noise level due to frequency multiplication is: