[time-nuts] SR620/PM66xx/CNT-90 input stages
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....
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use without that foundation.
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