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. 25, 2014
Filed:
Feb. 16, 2012
Jinho Choi, Saratoga, CA (US);
Hao Peng, Sunnyvale, CA (US);
Wanfeng Zhang, Palo Alto, CA (US);
Tuyen Doan, San Jose, CA (US);
Jinho Choi, Saratoga, CA (US);
Hao Peng, Sunnyvale, CA (US);
Wanfeng Zhang, Palo Alto, CA (US);
Tuyen Doan, San Jose, CA (US);
Marvell World Trade Ltd., St. Michael, BB;
Abstract
Methods, circuits, and systems for determining the presence of a chopped input signal are disclosed. A digital signal generator can produce multiple digital signals when an alternating current (AC) signal input reaches multiple threshold voltages. The times at which the threshold voltages are reached can be determined by looking at the times at which the digital signals go high and low. The differences between the times at which the digital signals go high and low are used to determine if the AC signal input is a leading or trailing edge chopped signal. The AC input signal is a leading edge chopped signal when the difference between the times at which the digital signals go high is less than a predetermined time threshold, and is a trailing edge chopped signal when the difference between the times at which the digital signals go low is less than a predetermined time threshold.