[time-nuts] how to find low noise transistors
KA2WEU at aol.com
KA2WEU at aol.com
Sat Jul 18 17:59:30 UTC 2015
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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