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
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