How do you measure "simple"? Do you count the chips and the passive components or do you count lines of code? Or maybe you draw a block diagram and count the blocks and the number of interconnections?
If you count chips the design with the micro controller wins by a long shot But if you count lines of code, even a one foot square PCB loaded with op amps and precision passive parts wins. I think the design presented here by Lars Walenious is about as simple as it gets. I build a GPS disciplined XO using only part of Lars' design so it was even more simple but I don't know if I got to 1E-10. (my goal was to experiment to find the simplest design that could still work, so removed everything I could.) Lars used a regular Arduino for the micro controller. These are by far the easiest to program micro you will find. Ease of use was their primary design goal. I used a "mini" version of the Arduino, same thing but smaller and 8x cheaper. An advantage of using a micro controller is that it is easy to make changes but I find most important is that it can log internal data so you can collect performance statistics and make informed design changes until you like the logged statistics On Sun, May 22, 2016 at 10:41 AM, Bernd Neubig <bneu...@t-online.de> wrote: > Hello Fellow time-nuts, > I am looking for a simple solution to discipline my 10 MHz reference OCXO in > my private lab with an 1 PPS signal from a separate GPS receiver. > I am curious if there is a solution possible without programming a > microcontroller, as I am an old-fashioned "analogue" guy ;) > I am well aware, that such a solution would have a lot of disadvantages, as > it cannot effectively compensate for short-term variations. However I would > be happy if such a KISS solution could achieve a stability (STS) of better > 1E-10 over an hour. I know this is a damned long integration time for an > analogue integrator... > If that sounds too weird, I am open to receive advises for a microcontroller > based solution. > > Thanks a lot for your comments to come. > BTW: you need not to teach me about basics of short-term stability. I just > want to evaluate the limits of a possible analogue solution. For sure, that's > not real disciplining, but more like a long-tau integration PLL > > Best regards > Bernd DK1AG > > _______________________________________________ > 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. -- Chris Albertson Redondo Beach, California _______________________________________________ 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.