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Design >> RF Design >> Noise Figure vs. Frequency
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Message started by chris2312 on May 26^th, 2011, 8:11am

Title: Noise Figure vs. Frequency
Post by chris2312 on May 26^th, 2011, 8:11am

I simulated a BJT and I noticed that the NFmin increases with increase of the operating frequency. Can somebody describe this effect ? Whats the reason ? Thanks.

Title: Re: Noise Figure vs. Frequency
Post by rfcooltools.com on May 26^th, 2011, 1:43pm

Chris2312,

I believe you are observing a diminishing current gain at higher frequencies in the presence of a constant (or diminishing at a different rate) output shot noise.

http://rfcooltools.com