Clock Signal in Electronics

In electronics and especially synchronous digital circuits, 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, like a metronome. Circuits using the clock signal for synchronization may become active at either the rising edge, falling edge, or, in the case of double data rate, both in the rising and in the falling edges of the clock cycle. Most clock generators produce a clock signal in the form of a square wave with a 50% duty cycle, usually with a fixed, constant frequency.

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