Several of the reciprocal counters (DC509, DC5010) Tektronix built for their TM500/TM5000 test equipment mainframes use a National Semiconductor noise generator chip to dither their reference clock. They do this mainly to handle the case where the input freq and reference clock are very close.
The noise generator chip is not a true noise generator. I think it used a ROM table to play back a fixed "random" bit pattern. _______________________________________________ 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.