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:
Apr. 17, 2001
Filed:
Apr. 16, 1998
Naoki Ueno, Tochigi-ken, JP;
Nippon Precision Circuits, Inc., Tokyo, JP;
Abstract
There is provided a D-type flip-flop circuit which is improved in terms of operating frequency. First and second current supplying circuits are provided as sources for supplying currents to first and third differential circuits for inputting data and to second and fourth differential circuits for holding data in a master circuit and a slave circuit. Further, timing for supplying the currents to the respective differential circuits for inputting and holding data are controlled by first and second clock signals, respectively. The D-type flip-flop circuit is improved in terms of operating frequency by optimizing timing for writing input data and timing for holding data by arranging the first clock signal so as to have a certain delay with respect to the second clock signal. Further, the D-type flip-flop circuit is improved with respect to the operating frequency also by optimizing the value of the currents supplied to the respective differential circuits.