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:
Sep. 01, 1998
Filed:
Jul. 25, 1996
Haruhiko Fujii, Tokyo, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
A variable delay circuit is disclosed comprising first and second clock delay sections, first and second phase comparison circuits, first and second data delay sections, and a selector. The first and second clock delay sections delay a clock signal to generate first and second delayed clock signals. The first and second phase comparison circuits respectively detect a phase difference between the clock signal and the first delayed clock signal and a phase difference between the clock signal and the second delayed clock signal. The first and second phase comparison circuits then respectively supply first and second delay control signals indicating the phase differences to the first and second clock delay sections so as to equalize the delay times of the clock delay sections to a period of the clock signal. The first and second data delay circuits delay a data signal. The delay times of the first and second data delay sections are respectively controlled based on the first and second delay control signals so as to be proportional to the period of the clock signal. One of the output signals of the first and second data delay sections is selected by the selector based on a delay designating data.