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An input resistance of 20 Kῼ causes a noise voltage of 10μV. Suppose two input resistance each of 20 Kῼ are connected in parallel, then find the total noise voltage?

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An input resistance of 20 Kῼ causes a noise voltage of 10μV. Suppose two input resistance each of 20 Kῼ are connected in parallel, then find the total noise voltage?

(a) 8μV

(b) 10μV

(c) 20μV

(d) 13μV

I got this question in unit test.

My question is based upon Spectrum of Multitone Signal topic in portion Amplitude Modulation of Analog Communications

1 Answer

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Right option is (a) 8μV

The explanation is: Thermal noise is distinct from shotnoise, which consists of additional current fluctuations that occur when a voltage is applied and a macroscopic current starts to flow.

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