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:
May. 28, 1985
Filed:
Nov. 30, 1982
Kenji Nakatsugawa, Tokyo, JP;
Hiroshi Itaya, Tokyo, JP;
Anritsu Electric Company Limited, Tokyo, JP;
Abstract
A phase detector is disclosed in which means are provided for sensing when two AC signals being subjected to phase difference measurement become close in phase, within a predetermined range, and for inverting one of these signals in phase when such a close phase relationship is sensed. The phase difference between the phase inverted signal and the other signal is then measured, and compensation is applied to the measured results such as to compensate for the effects of the phase inversion operation. Insensitivity and 'hunting' effects which occur with prior art phase detectors in the region of zero phase difference are thereby eliminated, and an output signal can be obtained which varies in a smooth and continuous manner with variations in the phase difference between the two signals under measurement, over a 360.degree. range.