prototype block-diagram, short list of chips in the implementation, and a discussion on resolution now on ohwr.org: https://ohwr.org/project/microstepper/wikis/Block-diagram
The obvious way to increase resolution (make the smallest frequency step smaller) is to lower the IF. I guess the limit is that we don't want the IF to feed-thru the phase-detector and PLL all the way to a PN-spur in the output-OCXO. My first prototype used 97 kHz IF and that gives a resolution of 1.7e-17. Lowering that by /2 or /4 might be a good idea? Other comments and ideas welcome! Anders > my plan is to present our DIY version of this, an open hardware design, at > EFTF2020. > we have two AD9912:s clocked at 1GHz (derived from the maser) producing > two LO's that drive a mixer-board that locks an OCXO that feeds a PICDIV. > >> >> _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
