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noise figure

britto over 14 years ago

Hi,

how to find noise figure for VGA?

pls provide tutorial if any..

thanks in advance.

Analog Design over 14 years ago

Have you done S-parameter analysis(In cadence Spectre simulator) ? In S-parameter analysis there is option for noise figure analysis .Because I have done noise figure analysis for LNA by S -parameter anlysis . I have not done for VGA ,But I think its is similar to LNA .
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britto over 14 years ago

Thanks for ur reply...
ya we did NF analysis in d same way as that of lna n we got 43db..
wat s range of NF for VGA
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Analog Design over 14 years ago

I have not analysed NF for VGA .But for LNA 3dB NF is agood result with in band of intrest . For VGA also I think 43dB is very poor result . You just compair with some other result of VGA given some published paper .
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