Cmos parallel dynamic logic and speed enhanced static logic

Abstract

A new CMOS dynamic logic family is based on parallel dynamic logic concept, avoiding stacked evaluation transistors. The basic configuration for the logic family is a pair of clock transistors including a NMOS and a PMOS transistor having parallel logic transistors connected between the NMOS and PMOS clock transistors. The parallel-connected transistors have gates for logic inputs and an output originating from one of a commonly connected source or drain. The family may provide NOR, NAND, OR, and AND. The family also includes BUF and INV. The BUF logic gate is realized with opposing NMOS and PMOS and an INV, while the INV uses either a single NMOS or PMOS transistor in place of the parallel-connected transistors. A speed enhanced skewed static logic gate is also provided. The speed enhanced gate uses a plurality of PMOS transistors and a plurality of NMOS transistors matched and joined as a plurality of separate gate inputs. An output from the gate is provided, and the size of PMOS and NMOS transistors are skewed. Positive feedback transistors are connected to the output. A noise suppression transistor is also connected to the output. A precharge transistor connected to the positive feedback transistors is fed from a clock signal from an associated circuit. The speed enhanced skewed state logic gate is preferably used to solve cascading problems, such as those in CD domino or the present parallel dynamic logic, and the speed enhanced static gates may be used instead of clock delay.