Whats the jitter-resisting benefit of dual complementary logic?
Signal traffic traveling in all directions on a pc board brings to mind a busy railroad switching yard. Some of the pc-board traces carry data signals, others haul dc supplies, and most are potential receivers or transmitters of transients and noise. The analog-signal world has long exploited differential transmission to minimize interference. With rising frequency–and RFI everywhere–so too are wireless technologies. Differential clock and signal transmission across circuit-board traces provides significant protection against pickup from neighboring circuits. This is because interference tends to be coupled into both conductors simultaneously. Differential-logic devices respond to the signal difference between inputs, not to signals between input and ground. Put more technically, crosstalk and noise become common mode and are ignored in proportion to the device’s common-mode rejection ratio (CMRR).
