I haven't followed this discussion, and I probably do not understand it well enough to comment, but here goes, anyway.
Have you considered the situation of using two J/K flip flops and an AND gate to subtract one bit stream from another? I drew up a circuit back in the 70s and never tried it out. However, I have a parts layout (no schematic) of a board used to do digital mixing of the 3 signals in an HF rig, and the chips on the board would seem to validate the simple circuit I drew out. I doubt the output would be "clean", and it's more of a pulse-stream subtracter than an actual mixer. It would probably only be useful to drive a frequency counter where the precision was just what's necessary for ham radio purposes just due to mixing jitter. NB: it's also possible I saw the circuit somewhere else and have a false memory that it's mine. I've had this piece of paper in my notes for LONG time. =) Bob - AE6RV ----- Original Message ----- > From: ed breya <[email protected]> > To: [email protected] > Cc: > Sent: Monday, June 24, 2013 7:13 PM > Subject: [time-nuts] Frequency subtraction with D-flip flops > > I am revisiting that tracking generator reference I brought up here a while > back, and trying to get my head around how a DFF can take the difference > between > two frequencies. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
