Clay
What's the effect of assigning the same label (Vout_2) to the outputs of
both output amplifiers as shown in your circuit schematic?
Bruce
life speed wrote:
Date: Fri, 12 Feb 2010 15:32:55 -0500
From: Bob Camp<[email protected]>
Subject: Re: [time-nuts] Advice on 10 MHz isolation/distribution
Hi
There are a few differences between what you are simulating and the schematics
Bruce posted earlier. The collectors of the input stages (q1, q4 and q7) seem
have to come unglued from the bases of the output stages. The 95 ohm / 100 nf
roll off networks seem to have vanished from the emitters of Q1 and Q7. There
are a few other minor things.
I suspect that once you get it back to a node-node feedback circuit, the
impedance at the splitting point will drop and the isolation will go up quite a
bit.
Bob
Hi Bob,
I see I fumbled the mouse, thanks. I had to spend a couple days working on
other parts of the design, but I am back at the 10 MHz circuit again. I don't
see the RC networks in the emitters of Q1, Q7 in the original schematic (design
3), although I tried them and also with a 1.6K ohm resistor and did not see
much difference.
I notice that the gain of 2 (6 dB voltage gain) happens in the first stage, and
the second stages seem to have an equal amount of loss, which is a reasonable
outcome for buffer/isolator circuit.
The isolation, while improved, seems to be only 50 dB from Vout_1 to Vout_2.
To make this circuit really effective, I think I would have to parallel two
Q4/Q1 two-stage amps. Either that, or there are still some mistakes.
Clay
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