Am I missing something here?
I understand the ease and fun of programming up an AVR as much as anyone but
surely this task could be accomplished easily with a chain of fast
synchronous TTL or CMOS dividers. A resynchronising FF could also be added
at the end to clean up the 1 pps if required. You wouldn't need to worry
about the maths or OBOBs either.
Admittedly you would need more PCB real estate but that shouldn't be a big
deal in most cases.
Morris
If anyone is interested in the equivalent functionality using an ATTiny25
(for instance, if you’re already heavily invested in AVR instead of PIC,
like I am), ping me. I’ve privately written code to solve almost the same
problem and it could easily be adapted into doing the same job.
Is there an easy circuit to build that can consistently deliver a 1 PPS
from a 10MHz source with excellent resolution and repeatability? My
first application is to test different 10MHz oscillators without a TIC
always attached and then compare the PPS output change over time
against a master GPSDO PPS with an HP53132A.
The circuit used for PPS generation would have to deliver consistent
PPS output with preferably not more than 100ps noise or jitter,
assuming a perfect source. I'm totally guessing that for this
resolution, the PPS would have to be generated and accurate to within
0.001Hz every second. If this is too difficult, maybe the integration
time can be increased to generate one pulse every 10second or every
100,000,000.00 cycles?
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