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@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 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx In a message dated 7/18/2015 1:19:57 P.M. Eastern Daylight Time, p...@petelancashire.com writes: https://scholar.google.com/scholar?q=measuring+transistor+noise&hl=en&as_sdt =0&as_vis=1&oi=scholart _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
