[time-nuts] Frequency Distribution Design Basic Module

Attila Kinali attila at kinali.ch
Fri Aug 21 10:31:01 EDT 2015

On Fri, 21 Aug 2015 10:48:01 +0200
timeok at timeok.it wrote:

> www.timeok.it/wp/wp-content/uploads/2015/08/Frequency-Distribution-Design-Basic-Module-v-1.0.pdf
> note: the Amplifier picture is a draft 

A schematic of the amplifier would be nice ;-)

The performance is quite good too, IMHO.

To reach the low noise levels you have envisioned, you need
to take special care on the power supply. Not just noise filtering,
but also magnetic coupling. 

The LT Journal from April 2015 has a nice article about their new LT3042
and how to exploit its performance: http://www.linear.com/docs/46405

I see that you have used an ferrite core transformer in the output.
According to Enrico Rubiola, a ferrite adds something in the -170dBc
to -180dBc of noise. So, it might be possible that you hit that...

Also you should pot the whole transformer to prevent the wires from
moving and dampen the microphonic effects of the ferrit.

			Attila Kinali

It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
                 -- Miss Matheson, The Diamond Age, Neil Stephenson

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