A major disadvantage of frequency multipliers is that they multiply the noise factor along with frequency.
A. true
B. false
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A major disadvantage of frequency multipliers is that they multiply the noise factor along with frequency.
A. true
B. false
This is because frequency and phase are both multiplied by the same factor. This increase in noise is also seen in dB, as the excess noise factor for the electron multiplication process is approximately 1.4 (square root of 2) over a wide range of gain levels. Varactor multipliers do not generate noise, but they do increase the phase noise on the input signal.
As a result, frequency multipliers consist of a nonlinear circuit that distorts the input signal and consequently generates harmonics of the input signal. Thus, while they can be used to extend the range of an oscillator up to 100 THz, they will also come with an increase in noise levels.