[EMAIL PROTECTED] wrote: > > In a message dated 4/10/2007 14:33:17 Pacific Daylight Time, > [EMAIL PROTECTED] writes: > > Yes ground bounce can play havoc with the effective switching thresholds. > One would expect this effect to be much worse with single ended clocks. > > Bruce > > > > Hi Bruce, > > not to give away too much, but in our Jackson-Labs Fury GPSDO we compensate > for VDD bounce as well by having fully-differential circuits with special > current balancing circuitry. > > Thus not only do clocks have to be differential, but every output of the > circuit should be differential as well to balance the VDD currents. > > This helps prevent feeding noise into the VDD rails, which can show up at > other IC's. We were able to completely get rid of spurs in our phase noise > measurements with this technique. > > bye, > Said > > > > ************************************** See what's free at http://www.aol.com. > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > Said
Yes differential input and output current mode logic with balanced loads works very well with low power supply noise coupling. Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
