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 ?
TriMode probing improves productivity by reducing setup time on standards tests for serial buses like PCI Express, Serial Attached SCSI and Thunderbolt that require both common-mode and differential signaling measurements.
Differential signaling has been around for a long time, and there is very little chance of it disappearing from the PCB design scene.
Differential signaling allows rejection of cross-talk and ground-bounce as common-mode noise.
The unfortunate problem is that many engineers wait until too late in the overall design process to start worrying or addressing high-speed differential signaling issues," Ritchey continued.
The differential signal already has a built-in reference, thus differential signaling can be used in situations where the driver and receiver do not share the same reference (ground).
Differential signaling provides for lower radiated electromagnetic emissions and susceptibility over widely used single-ended technologies such as BTL or GTL.
The quad VGA and 10- and 12-bit quad ADCs also feature serial, low-voltage differential signaling (LVDS) data outputs that simplify board layout and further enhance image quality by enabling more data conversion paths to be routed within a given printed circuit board area.
DRSL Signaling -- a 200mV differential signaling standard that provides superior common mode noise rejection with an on-chip terminated point-to-point topology that minimizes reflections and reduced signal transition times associated with device loading and PCB trace stubs.
The AD9445 also has an on-chip reference and track-and-hold, and parallel low-voltage differential signaling (LVDS) outputs to ease the interface to digital down-converters.
As with the AD9444 and the AD9445, the new AD9446 features parallel low-voltage differential signaling (LVDS) outputs, including an output clock, which simplifies the interface to digital processing components and reduces the potential for digital noise coupling back into the ADC core.
Specifically, the device provides differential signaling capability to the CAN bus via the transmit and receive pins of the CAN controller.

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