Lux, James P wrote: >>> Cheers >>> >>> Pablo >>> >>> >>> >> Pablo >> >> Flipflop mixers tend to produce glitches at the beat >> frequency transitions. >> A digital PFD in a PLL doesnt produce a beat frequency output >> when locked so such glitches arent a problem, >> >> > > I don't know that this is the case with modern PLL PFDs.. If only because > glitches at the transitions would cause other problems, so there's an > incentive to get rid of them. > > > Jim > > Surely metastability may occur when the mixer flipflop D input transitions occur close to its active clock transitions?
There is at least one patent (US5053651) that claims to eliminate such glitches in a digital mixer, however its output beat frequency is half the difference between the input frequencies. Bruce _______________________________________________ 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.
