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4.6. Switch Logic Networks

switches as Boolean operators

We have used MOS transistors to build logic gates, which we use to construct combinational logic functions. But MOS transistors are good switches—a switch being a device that makes or breaks an electrical connection—and switches can themselves be used to directly implement Boolean function [Sha38]. Switch logic isn’t universally useful: large switch circuits are slow and switches introduce hard-to-trace electrical problems; and the lack of drive current presents particular problems when faced with the relatively high parasitics of deep-submicron processes. But building logic directly from switches can help save area and parasitics in some specialized cases.


  

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