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 ?
Popular electrical standards such as USB, Ethernet, RS-485 and CAN use differential signaling and balanced twisted-pail media to provide reliable high-speed communication.
Acronyms ANSI American National Standards Institute | EMC Electromagnetic Compatibility | EMI Electromagnetic Interference | ESD Electrostatic Discharge | I/O Input/output | ICT Information Communications Technology | IEC International Electrotechnical Commission | IEEE Institute of Electrical and Electronics Engineers | LAN Local Area Network | LVDS Low-voltage Differential Signaling | SAN Storage Area Network | SAS Serial Attached | SCSI SCSI Small Computer System Interface | USB Universal Serial Bus
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.
Because multi-gigabit signals use differential signaling, and have rise/fall times less than 100 ps, it is important to match both sides of the differential signal to less than 10 ps, which translates to a length of just tens of mils on a PCB.
The 14 m[m.sup.2] 100-pin TQFP-packaged component includes four integrated SDI cable drivers, two SDI output drivers, two relocked loop-through drivers and a 5-bit differential signaling (LVDS) parallel bus for FPGA interface.
* An integrated video graphics array controller and the Graphics Media Accelerator 950 for graphics via a Peripheral Component Interconnect Express x16 port, low-voltage differential signaling and TV-out connector.
The HDMI standard uses transition minimized differential signaling (TMDS) technology, which provides differential signals with nominal amplitude transitions of 500mV.
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.
It boasts throughput exceeding 10Gbps utilizing low voltage differential signaling, (LVDS) technology.
Differential signaling schemes are a common approach to achieving higher noise immunity for critical signals in a high speed digital design.
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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