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Effective noise at high frequencies is ________

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Effective noise at high frequencies is ________

(a) Johnson noise

(b) Flicker noise

(c) transit-time noise

(d) Partition noise

The question was posed to me during an interview.

I need to ask this question from Time Domain Description topic in section Double Sideband Suppressed Carrier Modulation of Analog Communications

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Correct choice is (c) transit-time noise

To explain: Transit-time noise is alike to shot noise, and results if the time taken by electrons to reach from emitter to collector is comparable to the period of signals being amplified. Thus, transit-time noise occurs at high frequencies, whereas Flicker noise occurs below a few kilohertz and Johnson noise, also known as thermal noise, occurs at all frequencies.

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