On Thu, 22 Jul 2004 12:24:54 +0100, Paul Burridge
wrote:

NF isn't a consideration in this instance; please ignore it.
And I am well aware of the pi-model. I just want to know if I have it
right that Ebers-Moll will work accurately into UHF provided one
allows for the feedback capacitance and emitter junction capacitance
shunting the input signal around [EBR alone] and thereby reducing the
signal voltage developed across it. Do I have this right?

Sorry! Corrected above. IOW: whilst the emitter diode resistance is
bypassed at RF by these two capacitances, the base spreading
resistance *isn't* - apart from that, the rest of the post is now
correct, yes? IOW, as the signal frequency increases, the BSR becomes
the dominant component of the device's input impedance... Phew!
Unless of course, someone knows otherwise...
--

"What is now proved was once only imagin'd." - William Blake, 1793.