[time-nuts] Isolated 1PPS-input for distribution-amp?
bruce.griffiths at xtra.co.nz
Thu Aug 31 09:07:09 EDT 2017
HCPL7101 and similar 50MBaud optocouplers claim 50ps rms jitter.
Some non optical isolated couplers specify ~30ps jitter.
> On 01 September 2017 at 00:12 Anders Wallin <anders.e.e.wallin at gmail.com> wrote:
> Hi all,
> I'm looking for a solution for galvanic isolation of a 1PPS signal-input to
> a distribution amplifier.
> We have an old box using HCPL-2411 at the input followed by 74LS04, but the
> degraded rise-time (from below 3ns out of a clock, to >12 ns out of the
> box) and increased jitter (from below TIC-resolution of 20ps out of the
> clock to 700ps std.dev at 100s out of the box) are now limiting our
> Does anyone have experience with a circuit with good rise-time and low
> Should I look for better optoisolators, or pulse-transformers, or something
> thanks for your input!
> PS. I started on publishing my distribution-amplifier (non isolated) on the
> ohwr.org site, see https://www.ohwr.org/projects/pda-8ch-fda-8ch/wiki/wiki
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