Method and apparatus for ratioed logic structure that uses zero or negative threshold voltage

Abstract

A method and apparatus provides an efficient ratioed digital logic structure. The digital logic structure includes ratioed pull-up transistors and pull-down transistors such that the circuit noise margin does not substantially affect gain performance of the ratio stage. In one particular embodiment, a ratioed logic structure includes PMOS transistors and NMOS transistors that receive input voltage signals wherein a current path is induced in the NMOS transistors when a voltage input of zero or less is applied. Another feature of the present invention allows modification of gain performance of the ratio stage by arranging different ratios of the PMOS-to-NMOS transistor channel widths.

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