[time-nuts] how to find low noise transistors
KA2WEU at aol.com
KA2WEU at aol.com
Sat Jul 18 22:36:13 UTC 2015
Good afternoon,
another low noise recommended transistor is the
http://www.cel.com/pdf/datasheets/ne856m02.pdf and for frequencies below
10 Mhz
the 2N2857. This nice fact is that the AF and KF values are published,
the bad part is the the AF=1 value violates the law of physics.
http://www.microsemi.com/existing-parts/parts/47966
http://espice.ugr.es/espice/src/modelos_subckt/spice_complete/RF.LIB
Be careful !
Who says EE is easy.
Best regards , Ulrich N1UL
In a message dated 7/18/2015 3:56:53 P.M. Eastern Daylight Time,
time-nuts at febo.com writes:
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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