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:
Oct. 22, 1996
Filed:
Nov. 02, 1994
Atsushi Matsuda, Kawasaki, JP;
Tachio Yuasa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A D/A converter has a first partial circuit, and second and third partial circuits connected with said first partial circuit. The first partial circuit has a first row of K resistors of the same resistance value and groups of switches provided for the resistors, to select 'K-1' resistors among said K resistors and connect said selected resistors in series with said second and third partial circuits. The second partial circuit has a second row of L resistors, a first group of switches connected in series with said resistors, respectively, and a second group of switches connected in parallel with said series-connected second row of resistors and said first group of switches, respectively. The third partial circuit has a third row of L resistors, a third group of switches connected in series with said resistors, respectively, and a fourth group of switches connected in parallel with said series-connected third row of resistors and said third group of switches, respectively. Therefore, the D/A converter can reduces an occupied area thereof, and increases the number of D/A converter chips to be fabricated on a wafer, to thereby reduce the costs of the D/A converters.