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Clock skew (sometimes called timing skew) is a phenomenon in synchronous digital circuit systems (such as computer systems) in which the same sourced clock signal arrives at different components at different times due to gate or, in more advanced semiconductor technology, wire signal propagation delay.
slew rate effect on a square wave: red=desired output, green=actual output. In electronics and electromagnetics, slew rate is defined as the change of voltage or current, or any other electrical or electromagnetic quantity, per unit of
Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks. Even when initially set accurately, real clocks will differ after some amount of time due to clock drift , caused by clocks counting time at slightly different rates.
The last two corners (FS, SF) are called "skewed" corners, and are cause for concern. This is because one type of FET will switch much faster than the other, and this form of imbalanced switching can cause one edge of the output to have much less slew than the other edge. Latching devices may then record incorrect values in the logic chain.
Principal among these is clock/data misalignment, or clock skew. A phase-locked loop on the receiving side needs a high enough bandwidth to correctly track a spread-spectrum clock. [9] Even though SSC compatibility is mandatory on SATA receivers, [10] it is not uncommon to find expander chips having problems dealing with such a clock ...
Clock signal and legend. In electronics and especially synchronous digital circuits, a clock signal (historically also known as logic beat) [1] is an electronic logic signal (voltage or current) which oscillates between a high and a low state at a constant frequency and is used like a metronome to synchronize actions of digital circuits.
In huge circuits, signals sent over clock distribution network often end up at different times at different parts. [6] This problem is widely known as "clock skew". [6] [7]: xiv The maximum possible clock rate is capped by the logic path with the longest propagation delay, called the critical path.
Clock feedthrough is generally considered harmful. Methods to reduce clock feedthrough include: Slew rate reduction of the clock signal, usually by the resistor in series with the controlled gate. Reduction of the voltage swing of the clock signal; Reduction of the interconnects parasitic capacitance by rerouting interconnects