In electronics and synchronous digital circuits, such as most computers, a clock signal is a signal used to coordinate the actions of two or more circuits. A clock signal oscillates between a high and a low state, normally with a 50% duty cycle, and is usually a square wave. The circuits using the clock signal for synchronization may become active at either the rising or falling edge, or both (see for example DDR SDRAM), of the clock signal.
Some school clock signal sensitive mixed-signal circuits, such as precision analogue-to-digital converters, use sine waves rather than square waves as their clock signals, because square waves contain high-frequency harmonics that can interfere with the analogue circuitry and cause noise. Such sine wave clocks are often bb to pc data signal interface unit clock differential signals, because this type of signal has twice the slew rate, and therefore half the timing uncertainty, clock signal programmer of a single-ended signal with the same voltage range.
Most integrated circuits of sufficient complexity require a clock signal in order to synchronize different parts of the chip and to account for propagation delays. As chips get more complex, the problem of supplying accurate and synchronized clocks to all the circuits becomes more and more difficult. The preeminent example of such base band test interface data signal clock unit complex chips is the microprocessor, the central data unit signal interface clock part base band test interface bb to pc data signal clock unit interface data signal unit clock of modern computers.
A clock signal might also be gated, i.e. combined with a controlling signal, in order to enable or disable the clock signal for a certain part of a circuit. This technique is often used to save power clock signal by shutting down parts of a digital circuit data unit signal clock interface currently not being used.
The speed of a clock signal in a computer is called the clock rate or clock frequency.
Electronics Topics
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
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