Rick Karlquist wrote:
Bruce Griffiths wrote:
He's made similar comments before.
It actually isnt that difficult to achieve an isolation amplifier phase
noise floor below -170dBc/Hz if one is careful to use appropriate parts,
design techniques, and the input signal level is high enough.
The real problem is verifying that performance.
The 10811 production engineers searched for a long time for
a low noise buffer amplifier and settled on the ANZAC AMC-123.
The data sheet refers to a patent that reads like
a construction article. You can make your own if you can find
an old 2N5109 transistor.
Rick Karlquist N6RK
The Tyco/MAcom version of the AMC-123 datsheet doesn't refer to a patent.
Is a variant of a Norton CB transformer feedback amplifier?
One would need to cascade a number of these to achieve a reverse
isolation of 120dB.
Whilst I dont have any 2N5109's, I do have several 2N5943's.
Bruce
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