[time-nuts] Distribution Amp project
bruce.griffiths at xtra.co.nz
Fri Jul 31 00:28:15 UTC 2009
Richard (Rick) Karlquist wrote:
> Dave M wrote:
>> I haven't been able to find schematics for the Extron DA, but
>> according to the author's discussion, it seems to be very similar to
>> the DA circuit schematics at
>> http://www.ko4bb.com/~bruce/IsolationAmplifiers.html. I haven't had
>> time to reverse engineer the circuit in my Extron DA, but it surely
>> would be nice to avoid it if possible. Anyone have a schematic, or a
>> source for it?
> In the KO4BB citation, the common base discrete amps are going to give
> considerably better performance than the video distribution amplifier
> you were asking about.
> Rick Karlquist N6RK
A prototype discrete design that is an enhanced (lower distortion,
higher output) version of the common base cascade shown has been
verified (as expected) by measurement to have substantially lower phase
noise than the TADD-1 opamp based design. It also has lower phase noise
than the 5087A.
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