Brooke wrote:
Does hFE (DC) have much relevance to this? Would hfe (AC) be the important one?
It depends on whether you are more interested in the 1/f noise, which causes most of the phase noise in oscillators and the additive ("residual") PN in amplifiers, or the in-band noise. As I said in the message to which you replied:
Note that these are static (DC) curves, which are good approximations for the 1/f region. The curves in the white noise region, even at relatively low frequencies like 1 kHz, generally fall off faster than this as current is reduced, so the effect of reduced beta on in-band noise figure is greater.
Best regards, Charles _______________________________________________ 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.
