Mr RB
Well-Known Member
HI, I'm doing some time calibration and measuremnt stuff using a GPS module that puts out 1Hz timepulse, at 50% duty cycle.
The GPS unit makes the 1Hz pulse using a DDS system from it's internal xtal (TCXO) and the result is that the average seconds are perfect (over enough seconds) but any individual second can have a tiny amount of edge jitter caused by the digital timing system inside the GPS module.
It would be handy if I could remove that edge jitter in an analogue circuit and get the filtered average seconds, which I am going to use to discipline another oscillator.
Does anyone have a suggestion for a massively resonant 1Hz circuit? Something that resonates at 1Hz, and is fed from the GPS 1Hz pulse. Ideally it should be resonant to the point that even if the input pulse stops it should still keep resonating at 1Hz for 30 or so seconds.
The idea is that any edge jitter on the incoming 1Hz signal would be insignificant compared tot he average 1Hz resonance.
Thanks!
The GPS unit makes the 1Hz pulse using a DDS system from it's internal xtal (TCXO) and the result is that the average seconds are perfect (over enough seconds) but any individual second can have a tiny amount of edge jitter caused by the digital timing system inside the GPS module.
It would be handy if I could remove that edge jitter in an analogue circuit and get the filtered average seconds, which I am going to use to discipline another oscillator.
Does anyone have a suggestion for a massively resonant 1Hz circuit? Something that resonates at 1Hz, and is fed from the GPS 1Hz pulse. Ideally it should be resonant to the point that even if the input pulse stops it should still keep resonating at 1Hz for 30 or so seconds.
The idea is that any edge jitter on the incoming 1Hz signal would be insignificant compared tot he average 1Hz resonance.
Thanks!