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Niose Parameters not listed with S-Parameters ? (Read 3409 times)
Stanley
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Niose Parameters not listed with S-Parameters ?
Jul 25th, 2008, 6:12am
 
I have a question that I cannot find a good answer to;  Why when you go the manufactures web site for a transistor or FET they give you the S2P file with the S-Parameters, but they do not include the noise parameters?  (Fmin, Γopt, Rn, freq) Is their a way to get Γ[sub]opt and R[sub]n from knowing F[sub]min and the S-parameter for that frequency.  
Every design book I have for LNA says that they give this information to you.  
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pancho_hideboo
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Re: Niose Parameters not listed with S-Parameters ?
Reply #1 - Jul 25th, 2008, 6:55pm
 
Stanley wrote on Jul 25th, 2008, 6:12am:
Why when you go the manufactures web site for a transistor or FET they give you the S2P file with the S-Parameters, but they do not include the noise parameters?  (Fmin, Γopt, Rn, freq)

This is because noise parameters are not stable and need high cost in measurement compared to s-parameters.

Stanley wrote on Jul 25th, 2008, 6:12am:
Is their a way to get Γ[sub]opt and R[sub]n from knowing F[sub]min and the S-parameter for that frequency.

You can't derive Γopt and Rn from Fmin and S-parameters.


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