Apparatus for comparing the weight of a binary word to a number

Pulse or digital communications – Receivers

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375340, 34082579, H04L 2706

Patent

active

056235194

ABSTRACT:
A logic circuit (260) includes recursive elements (470, 1070, 1400, 1600) interconnected in a matrix (300), and M data inputs (490), and a logic circuit output (475). In one embodiment, N+1 binary column setup inputs (485), and M-N binary row setup inputs (480) are also included. The matrix (300) is an arrangement of the recursive elements (470) in rows, columns, and diagonals. The M data inputs (490) are for coupling the M bits of the binary word to the recursive elements (470). The logic circuit output (475) includes an output (810) of one of the recursive elements (470, 1070, 1400, 1600). The logic circuit output (475) has a binary value determined by a comparison of the number of bits having a first binary value within the binary word, to the predetermined number, N. In the one embodiment, the comparison is determined by the values of the setup inputs (480), (485).

REFERENCES:
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patent: 5349611 (1994-09-01), Varian
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patent: 5381126 (1995-01-01), McClure
patent: 5392289 (1995-02-01), Varian
Carver A. Mead, "Introduction to VLSI Systems", Oct. 1980, pp. 78-80 & 374.
Samuel H. Caldwell, "Switching Circuits and Logical Design", Feb. 1967, pp. 236-271 & 414-449.
Jacob Millman, Ph. D. "Microelectronics Digital and Analog Circuit System" McGraw Hill, 1979, pp. 186-199.

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