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dd2001
Joined: 14 Apr 2002
Posts: 282
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 02 Feb 2004 5:52 active filter noise figure |
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Anyone knows how to calculate active filter noise figure?
thanks.
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willyboy19
Joined: 15 Feb 2004
Posts: 158
Helped: 10
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| 01 Mar 2004 1:09 Re: active filter noise figure |
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It is based on the same principle as you did for your LNA/mixer:
First you need to calculate your input referred noise power. Then you need to assume a certain impedance level (for example, 1kohm is a typical number). Then you perform:
NF = (4kTRin + Pin)/(4ktRin),
where Rin= 1kohm, Pin is the input referred noise power. The calculation above include input-referred noise voltage AND current.
Willy
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kkoko
Joined: 07 Dec 2004
Posts: 22
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| 06 Jan 2005 15:08 Re: active filter noise figure |
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| i think that you hate to make relation between SNRout and SNRin
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cmosbjt
Joined: 25 Apr 2004
Posts: 227
Helped: 8
Location: Boston
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| 06 Jan 2005 16:26 Re: active filter noise figure |
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| kkoko wrote: |
| i think that you hate to make relation between SNRout and SNRin |
have?
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