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. 25, 2013
Filed:
Jun. 24, 2009
Applicants:
Kazuhiro Yamamoto, Tokyo, JP;
Toshiyuki Okayasu, Tokyo, JP;
Inventors:
Kazuhiro Yamamoto, Tokyo, JP;
Toshiyuki Okayasu, Tokyo, JP;
Assignee:
Advantest Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/50 (2006.01);
U.S. Cl.
CPC ...
Abstract
A time measurement circuit measures the time difference between edges of a first signal and a second signal. A sampling circuit acquires the logical level of the first signal at a timing of the edge of the second signal. When a sampling circuit enters a metastable state, an output signal thereof transits with a long time scale. A transition time measurement circuit measures a transition time (settling time) of the output signal of the sampling circuit in the metastable state.