More-than-one detector

Details More-than-one detector More-than-one detector

1996-04-10

1998-09-29

Westin, Edward P.

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Field-effect transistor

326108, 341102, H03K 19094, H03K 19082

Patent

active

058150072

ABSTRACT:
In order to provide a detector with fewer switching elements for detecting simultaneous occurrence of more than one of logic `1` or logic `0` out of plural inputs, 4 inputs A, B, C and D for example, a detector of the invention detects more than one of logic `1` from NAND logic of outputs of 3 OR-NAND composit gates as follows. ##EQU1## Each OR-NAND composit gate is composed of 4 pMOS transistors for common use and 4 nMOS transistors and a NAND gate of 3 inputs is composed of 3 pMOS transistors and 3 nMOS transistors.
Therefore, the detector of 4 inputs of the invention can be composed of 22 MOSFETs insted of 36 MOSFETs needed for a conventional detector of 6 NAND gates of 2 inputs and a NAND gate of 6 inputs.

REFERENCES:
patent: 3900742 (1975-08-01), Hampel et al.
patent: 4069426 (1978-01-01), Hirasawa
patent: 4584567 (1986-04-01), Kinghorn
patent: 4745306 (1988-05-01), Shimada

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