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LVDS is a physical layer specification only; many data communication standards and applications use it and add a data link layer as defined in the OSI model on top of it. LVDS was introduced in 1994, and has become popular in products such as LCD-TVs, in-car entertainment systems, industrial cameras and machine vision, notebook and tablet ...
Current mode logic (CML), or source-coupled logic (SCL), is a digital design style used both for logic gates and for board-level digital signaling of digital data.. The basic principle of CML is that current from a constant current generator is steered between two alternate paths depending on whether a logic zero or logic one is being represented.
To obtain better performance and lower costs, semiconductor manufacturers reduce the device geometries of integrated circuits. With each reduction the associated operating voltage must also be reduced in order to maintain the same basic operational characteristics of the transistors.
A level shifter connects one digital circuit that uses one logic level to another digital circuit that uses another logic level. Often two level shifters are used, one at each system: A line driver converts from internal logic levels to standard interface line levels; a line receiver converts from interface levels to internal voltage levels.
Care must be taken with the termination network. RS-423 is a similar specification for unbalanced signaling. When used in relation to communications wiring, RS-422 wiring refers to cable made of 2 sets of twisted pair , often with each pair being shielded, and a ground wire.
Like LVDS, the data is transmitted serially over the data link. When transmitting video data and used in HDMI, three TMDS twisted pairs are used to transfer video data. Each of the three links corresponds to a different RGB component. The physical layer for TMDS is current mode logic (CML), [2] DC coupled and terminated to 3.3 Volts. While the ...
The logic was also called a current-mode circuit. [12] It was also used to make the IBM Advanced Solid Logic Technology (ASLT) circuits in the IBM 360/91. [13] [14] [15] Yourke's current switch was a differential amplifier whose input logic levels were different from the output logic levels.
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