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. 28, 2005
Filed:
May. 14, 2002
Junichi Okamura, Yokohama, JP;
Junichi Okamura, Yokohama, JP;
Thine Electronics, Inc., Tokyo, JP;
Abstract
In a semiconductor integrated circuit including a phase comparison circuit for a DLL in a reception circuit for receiving serial digital transmission signals, phase detection characteristics of the phase comparison circuit are improved while preventing false lock so as to improve response speed and locking accuracy of the DLL as a whole. The semiconductor integrated circuit includes series-connected delay elements each having a delay time which is controlled in accordance with a control voltage, a phase comparison circuit for generating a voltage corresponding to a phase difference between a clock signal input to a predetermined one of the delay elements and a clock signal output from another predetermined one of the delay elements, a control circuit for controlling the phase comparison circuit to generate a predetermined voltage when said phase difference is within a predetermined range, and a filter circuit for filtering the voltage generated by the phase comparison circuit to generate the control voltage to be applied to the delay elements.