[time-nuts] Re: Input stage for time interval counter

[Michael Fahmie]

I would go with the transformer input. It would remove any common mode
current flowing on the inputs that might 'modulate' the switching
thresholds.
-Mike-


On Wed, Nov 30, 2022 at 12:41 PM Hans-Georg Lehnard via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi all,
>
> I am currently working on a 2 channel time interval counter. It should
> measure frequencies from 5 to 20 MHz. And hopefully have a resolution
> about 1E-13 at 0,1s to measure HP10811 OCXO stability.
>
> For inputs should I use  UNBAL Rf transformers 1:4 (1:16) or drive the
> LTC9657 directly.
>
> Thanks for your suggestions
>
> hgl
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