The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 2004
Filed:
Jan. 02, 2001
Tadahiro Ohmi, Aoba-ku, Sendai-shi, Miyagi-ken, JP;
Tadashi Shibata, Koto-ku, Tokyo, JP;
Akira Nakada, Tokyo, JP;
Tatsuro Morimoto, Miyagi-ken, JP;
Takahisa Nitta, Tokyo, JP;
Other;
Abstract
A semiconductor arithmetic unit which realizes a maximum or minimum value retrieval operation at high speed and with a high degree of accuracy used in a vector quantization processor is composed of a binary-multivalue-analog merged operation processing circuit. A multi-loop circuit includes an amplifying circuit group composed of a plurality of sets of first amplifiers with a floating gate to which first electrodes and a single second electrode are capacitively coupled with a predetermined ratio, a logical operation circuit to which output signals of the amplifying circuit group are inputted and which outputs a logical 0 or 1, and a second amplifying circuit to which an output signal of the logical operation circuit is inputted and whose output is distributed to all of the second electrodes of the amplifying circuit group. The second amplifying circuit includes an adjusting circuit which adjusts an output current driving ability and a controlling circuit which controls the adjustment with a predetermined regulation. The adjustment of the controlling circuit is executed according to variation of the output of the logical operation circuit.