[time-nuts] TAPR TICC boxed
bruce.griffiths at xtra.co.nz
Thu Mar 30 23:24:20 EDT 2017
A single or dual supply CMOS output comparator should suffice together with some diode clamps.
Since the TICC only resolves a few tens of picosec the choice of comparator etc isnt critical.
LTC6752 (~$US2) or similar perhaps?
A single supply comparator should suffice unless you want to measure NECL or similar signals.
> On 31 March 2017 at 09:15 Mark Sims <holrum at hotmail.com> wrote:
> What did you do for input protection?
> I want to build an input system for the TICC that incorporates some input protection, switchable terminator, possibly settable threshold and edge selects, and a switchable PICDIV divider like the TADD-2 Mini. That would allow inputs of <1 .. 100 (or maybe up to 1000) PPS and 1/5/10/15 MHz inputs.
> The main problem I'm having is coming up with an input squarer circuit that is simple and cheap but can handle basically DC-15 MHz. Anybody got any ideas?
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