differential signaling

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differential signaling

Using two wires for each electrical path for high immunity to noise and crosstalk. The signals are sent down one wire as positive and the other as negative, and the circuit at the receiving end derives the signal from the difference between the two.

Differential Vs. Single-Ended
Differential signaling is superior to single-ended signaling, where the reference voltage is ground and can vary over long distances. In differential signaling, the reference voltage is controlled. Typically, twisted pairs are used so that external radiation impacts both wires at the same place, and the noise can be detected more easily. See LVDS and SCSI.
References in periodicals archive ?
Application of Mathcad for simulating such single-ended signaling is demonstrated by FIGURES 11 and 12.
1pF, the USBULC6-2M6 is suitable for a wide range of high-speed differential and single-ended signaling applications.
Differential pairs are used to specifically create a closely coupled return path for the signal, eliminating most of the single-ended signaling problems (like the aforementioned twisted pair).
With the addition of FlexMode[TM] interface technology, a multi-modal, SoC memory interface PHY, supporting both differential and single-ended signaling, can be implemented in a single SoC package design with no additional pins.
We have paved multiple paths for the industry by providing solutions that extend single-ended signaling beyond today's limits and developing the means for a seamless transition to differential signaling," said Sharon Holt, senior vice president and general manager of the Semiconductor Business Group at Rambus.
LVDS is a relatively new data transmission standard (Telecommunications Industry Association 644) that offers significantly higher signaling rates with less electromagnetic interference (EMI) than single-ended signaling such as TTL, CMOS and their derivatives.
9-WA3, Pseudo-Differential Vector Signaling for Noise Reduction in Single-Ended Signaling Systems
Dan Oh, Woopoung Kim, Joong-Ho Kim, John Wilson, Ralf Schmitt, Chuck Yuan, Lei Luo, Jade Kizer, John Eble and Fred Ware, "Study of Signal and Power Integrity Challenges in High-Speed Memory I/O Designs Using Single-Ended Signaling Schemes"
The shielding is flexible to allow for column differential, row differential (for within-pair skew reduction), and single-ended signaling.

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