[time-nuts] Divide by 3

Nick Sayer nsayer at kfu.com
Wed Jun 8 21:47:05 EDT 2016

> On Jun 8, 2016, at 9:59 AM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> You can achieve substantially lower jitter (phase noise) with a regenerative divider, which also allows you to divide by 3/2 for a 10MHz output.  I've built several like that, and they work extremely well.
> There are simpler divide-by-three logic circuits (generally, the simpler the circuit the closer to an exact 50% duty cycle and the lower the jitter).  See the attached image for one approach.

Very nice! That one also simulates properly on CircuitLab without the delay gates in the output feedback. I tried adding the delay gates back in, and it didn’t change, but I can imagine that’s just because it’s a simulator.

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