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input rms noise vs. input-referred noise

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x1346

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hi all,
if the input rms noise of an amplifier is AVrms, the bandwidth is BHz, and the input-referred noise is CV/rtHz. Assuming the noise is flat.
1. What's the relation between A and C? does C equal A/rtB?
2. How to convert A (or C) to decibal? is NF=10log(1+C/4kTRs) or NF=10log(1+C/kTRs)? which one is correct?
thanks in advance.
andy
 

RCinFLA

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Think total noise power. Noise power will be evenly spread across bandwidth, assuming noise is flat.

Think noise temperature. Convert noise temp to NF if you want expressed in NF.
 

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