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What is the maximum average effective input noise temperature that an amplifier can have if its average standard noise figure is to not exceed 1.7?

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What is the maximum average effective input noise temperature that an amplifier can have if its average standard noise figure is to not exceed 1.7?

(a) 203 K

(b) 215 K

(c) 235 K

(d) 255 K

I had been asked this question in a job interview.

The above asked question is from Noise in portion EDC Overview of Electronic Devices & Circuits

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Right answer is (a) 203 K

Explanation: The required answer is 290 x (1.7-1) or 203K.

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