Thanks, Bruce. I considered the idea of a multiplier but would like to use a software-only solution if I can. That's not only for simplicity, but also to eliminate additional sources of jitter; the experiment I have in mind is to test the second-to-second noise (and short term noise trends) of GPS and other PPS sources,* so I'm looking for as stable a reference as I can get. The additional noise from a mulitplier may be small, but I want to minimize the number of unknowns.
Thanks! John * I realize that I'll also be limited by counter resolution. ---- Bruce Griffiths said the following on 04/11/2008 05:56 PM: > John Ackermann N8UR wrote: >> Has anyone come up with a 5 MHz input version of TVB's PIC divider? I >> could use one... >> >> Thanks, >> >> John >> >> > John > > You could always cheat using a simple frequency doubler. > Use a pair of diodes to create a fullwave rectified sinewave followed by > a comparator for a sinewave input. > A simple feedback loop can be used to ensure the comparator output duty > cycle is 50%. > > Use a circuit that generates a pulse on every transition for a square > wave input. > Low pass filtering the square wave can be used to produce a waveform > that the comparator above could work with. > A feedback loop could be used to maintain the comparator output duty > cycle at 50%. _______________________________________________ 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.
