Look at the LPRO manual. They have a couple of circuits that uses a single CMOS gate with a capacitively coupled input. Wenzel has some very similar circuits on their web site (search for "Wenzel squarer"). My HP-531xx counter calibrator board uses on as the input squarer (with a 74HCT86 as the gate). I measured the ADEVs of the output and they were indistinguishable from the input.

In the 5071A, we squared up an 80 MHz clock with a 74AC04 gate capacitively coupled with resistive bias to set it at half the supply current; not a resistor from input to output as you often see. Ever since the LT1016 came out, it has been the "easy" way to square up a sine wave. Easy != high performance. The temperature drift of the delay time in the LT1016 is very substantial. Regarding ultra high speed comparators: No you don't want the fastest one you can get. That just maximizes the jitter. You merely want "good enough" speed. In any event, comparators are never a low jitter way to square up a sine wave. Rick N6RK On 3/3/2018 10:34 AM, Mark Sims wrote: > Look at the LPRO manual. They have a couple of circuits that uses a single CMOS gate with a capacitively coupled input. Wenzel has some very similar circuits on their web site (search for "Wenzel squarer"). > > My HP-531xx counter calibrator board uses on as the input squarer (with a 74HCT86 as the gate). I measured the ADEVs of the output and they were indistinguishable from the input. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > >