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. 13, 2002
Filed:
Aug. 23, 1999
Applicant:
Inventor:
Christopher Ludeman, Palm Bay, FL (US);
Assignee:
Intersil Corporation, Palm Bay, FL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M 9/00 ; H04M 1/00 ; H04M 3/22 ;
U.S. Cl.
CPC ...
H04M 9/00 ; H04M 1/00 ; H04M 3/22 ;
Abstract
In a subscriber loop interface circuit, a novel method and apparatus for measuring loop impedance. Measurement of loop impedance including charging and discharging a capacitor using current derived from loop current and loop voltage. The discharge time interval of the capacitor may provide information on loop impedance. A look-up table in a subscriber loop interface circuit may include previously calculated impedance values corresponding to discharge time.