Hi I very much would not implement that circuit these days. A logic buffer based design beats it on pretty much ever (useful) spec in the book.
Bob > On Nov 26, 2014, at 7:52 AM, Charles Steinmetz <csteinm...@yandex.com> wrote: > > Bruce wrote: > >> A single 2N2222 or equivalent transistor in a suitable circuit dissipating >> about 200mW or so can achieve a reverse isolation of 35dB with distortion of >> around -40dBc (output +13dBm) with a gain of unity, and an output impedance >> of 50 ohms with a PN floor of around -180dBc/Hz or so. > > For those wondering, I suspect Bruce had in mind something like the attached > (he posted the basic design a few years ago). I built 8 channels using > toroids on FT37-61 cores. I think the Mini-Circuits T622 should work, but I > have not tried it. The analyses are from my simulation, and the constructed > unit performed similarly. The Miller effect limits fan-out to about 10 for a > 10MHz distribution amp. [Note: the 50 ohm resistors on the outputs represent > the external loads, and are not part of the amplifier.] > > Best regards, > > Charles > > > <Distribution_amp_one_stage_CE_2N3904_after_Griffiths.gif>_______________________________________________ > 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.
