[time-nuts] SR620/PM66xx/CNT-90 input stages

Attila Kinali attila at kinali.ch
Wed Jun 21 04:34:52 EDT 2017


On Tue, 20 Jun 2017 17:11:24 -0400
Charles Steinmetz <csteinmetz at yandex.com> wrote:

> I was going tp post the Smith chart for the input of the AD96885/7 ECL 
> comparator they use, but was surprised to find that AD did not include 
> it on the datasheet.  However, just from the spec table we can see why a 
> buffer is necessary:
> Input Resistance:       200k ohms
> Input Capacitance:     2pF

Thanks everyone! I was caught again in my DC line of thinking.
Even though I saw the capacitance spec, it didn't registers.

At some point I need to learn how to design RF circuits....

			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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