[time-nuts] LT1016 as a pulse shaper...
Richard (Rick) Karlquist
richard at karlquist.com
Sat Mar 3 14:06:40 EST 2018
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
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.
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.
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