[time-nuts] how to find low noise transistors

[KA2WEU at aol.com]

Good afternoon,
 
There is a problem in the literature that people confuse the  "spot noise 
figure" and the "large signal " noise properties. Here AF and KF  needs to be 
known and considered.
 
 
Here is the mathematical correct  formula in a Word for Windows Form  
attached file.
If you use it for publications, please quote me . Thanks 
 
My advise is take a BIP transistor , fT not much more then 20 x operating  
frequency  (lower flicker component) and operate it at 15 to 20 % of  ICmax.
 
 The BFG540 is amongst the best Oscillators  oscillators 
 
http://www.nxp.com/documents/data_sheet/BFG540_X_XR_N.pdf
 
Now you outperform most colleagues 
 
73 de Ulrich N1UL
 
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In a message dated 7/18/2015 1:19:57 P.M. Eastern Daylight Time,  
pete at petelancashire.com writes:



https://scholar.google.com/scholar?q=measuring+transistor+noise&hl=en&as_sdt
=0&as_vis=1&oi=scholart



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