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. Bruce > > On 31 March 2017 at 09:15 Mark Sims <[email protected]> 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? > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
