What is static and dynamic devices in digital electronics?
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In integrated circuit design, dynamic logic (or sometimes clocked logic) is the design methodology in the combinatory logic circuits, particularly those implemented in the MOS technology. It is distinguished from so-called static logic by exploiting the temporary storage of information in stray and gate capacitances. It was popular in 1970s and has seen a recent resurgence in design of high speed digital electronics, particularly computer CPUs. Dynamic logic circuits are usually faster than the static counterparts, and require less surface area, but they are more difficult to design. Dynamic logic has the higher toggle rate clarification needed than static logic but the capacitive loads being toggled are smaller so overall power consumption of dynamic logics may be higher or lower depending on various tradeoffs. When referring to the particular logic family, dynamic adjective usually suffices to distinguish the design methodology, e.g. dynamic CMOS or the dynamic SOI design.
Dynamic logic is distinguished from static logic in that dynamic logic uses the clock signal in its implementation of combinational logic circuits. The usual use of the clock signal is to synchronize transitions in sequential logic circuits. For most implementations of combinational logic, the clock signal is not even needed.
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