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.
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Most important, differential signaling allows the receiver to filter out noise.
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To mitigate many of the design problems associated with high-speed single-ended and/or parallel busses, Serial ATA uses low voltage differential signaling. With this approach, each data signal is in fact transmitted over two lines which carry equal and opposite versions of the signal.
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The HDMI standard uses transition minimized differential signaling (TMDS) technology, which provides differential signals with nominal amplitude transitions of 500mV.
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IDT (Integrated Device Technology, Inc.) (Nasdaq:IDTI), a communications IC company, has announced its entry into the high-performance clock distribution market with the introduction of a family of industry leading, low-voltage differential signaling (LVDS) fan-out buffers.
IDT introduces new family of high-performance LVDS fan-out buffers
It boasts throughput exceeding 10Gbps utilizing low voltage differential signaling, (LVDS) technology.
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Differential signaling schemes are a common approach to achieving higher noise immunity for critical signals in a high speed digital design.
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The Open Low Voltage Differential Signaling Display Interface v0.95, or OpenLDI, defines how an FPD connects to the display driver in a laptop computer.
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