Differential Pairs are fantastic for routing long connections as they can remove common-mode noise and overcome any changes in ground potential.
What are Differential Pairs?
Differential pairs comprise two complementary parts. They can carry faster signals than single-ended connections.
Benefits of Differential Pairs
- The received signal is the difference between the two complementary parts, so noise on one side is canceled by similar noise on the other
- Most differential pairs are routed closely parallel, and they couple electromagnetically. Key parameters such as differential impedance are localized, creating a tight signaling channel. Radiated electromagnetic interference (EMI) is also more localized. Careful routing is essential.
- eCADSTAR provides facilities to make sure differential-pair routing will produce correct results
These short videos explain the basics of this technique – illustrated in eCADSTAR
Differential Pair Primer
- How differential signaling differs from single-ended
- Odd-mode, even-mode, and differential impedance
A Differential Pair and its Termination
- Why differential length-matching alone is not enough
- Subtle considerations when terminating
- How mode-dependence varies with coupling
Discover more about the full capabilities of eCADSTAR through our datasheets, videos, and webinars. Should you be ready to take it to the next step request a free evaluation to experience our PCB software for yourself. Unified, connected, and comprehensive, eCADSTAR has all you’ll need to take a project from conception to production.
Jane Berrie•Electronic Design Technology PartnerJane Berrie is an EDA product innovator and technical marketing content creator, focusing on high-speed design and signal integrity. She is a published author of technical articles and a past session chair at the annual Design Automation Conference (DAC).
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