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:
Nov. 02, 2004
Filed:
Apr. 29, 2003
Misao Suzuki, Tokyo, JP;
Elpida Memory, Inc., Tokyo, JP;
Abstract
A DLL circuit includes: an output dummy circuit having a prescribed propagation delay; a first delay element delaying a reference clock in accordance with a control signal and supplying the delayed signal to the output dummy circuit; a phase determination circuit comparing the phases of the reference clock and a feedback signal and supplying a control signal altering the delay amount of the first delay element; a second delay element receiving either the reference clock or the feedback signal, to serve as the trigger of the phase comparison operation, and delaying this signal by a delay amount; and a latch circuit latching the other signal not serving as the trigger of the phase comparison operation in synchronization with the rising edge of the output signal of the second delay element and supplying a signal turning on or off the input of the other signal to the phase determination circuit.