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. 14, 2009
Filed:
Feb. 09, 2007
Ichiro Kumata, Kanagawa, JP;
Ichiro Kumata, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
A digital DLL circuit includes: a register configured to hold a delay target value; an oscillator; a first counter configured to count an external reference clock or an oscillation output from the oscillator; a second counter configured to count the oscillation output from the oscillator or the external reference clock in every measurement cycle determined by the first counter; and a digitally-controlled variable delay circuit. The DLL circuit further includes a control circuit configured to control the reset and activation of the first counter and the second counter, and control the stop of the first and second counters according to need, based on a count value of the first counter, the control circuit subjecting a count value of the second counter and the delay target value of the register to a digital arithmetic operation, and supplying the variable delay circuit with a result of the arithmetic operation as a delay control value.