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:
Jun. 14, 2011
Filed:
Aug. 15, 2007
Masakatsu Suda, Tokyo, JP;
Masakatsu Suda, Tokyo, JP;
Advantest Corp., Tokyo, JP;
Abstract
A variable delay circuit is designed to provided a wider range of delay time to a timing signal. The variable delay circuit includes a variable delaywhich comprises a DA converterwhich supplies currentbased on delay setting data; a delay elementwhich imparts a delay amount Tpd to a prescribed signal and outputs the signal; and a bias circuitwhich is connected such that the amount of current flown in the DA converterand the amount of current flown in the delay elementbecome equal. The DA converterallows the relationship between the delay setting data DATA and the current Id to be hyperbolic (inversely proportional). As a result, the relationship between the delay setting data DATA and the delay amount Tpd can be linearized, whereby the delay amount obtained by a single stage of the delay element can be increased.