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:
Aug. 04, 1981
Filed:
Jun. 18, 1979
Applicant:
Inventor:
Michael C Fischer, Santa Clara, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324 / ; 324 / ;
Abstract
Two input signals of uncertain phase relationship are applied to trigger circuits which develop sharply defined logic level transitions in response to the input signals crossing predetermined amplitude threshold levels. These logic level transitions are then used to clock a register whose outputs are gated and filtered to provide a DC output signal whose level indicates the phase difference between the two input signals.