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. 17, 1997
Filed:
Apr. 10, 1996
Applicant:
Inventor:
Walter S Schopfer, Austin, TX (US);
Assignee:
Advanced Micro Devices Inc., Sunnyvale, GA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
379412 ; 379377 ; 379382 ; 379463 ;
Abstract
A power cross detection circuit that detects a power cross condition on the ring and tip lines of a telephone system. The power cross detection circuit senses a loop current flowing across a ring feed resistor, as well as a loop voltage at a first node and a second node at opposite ends of the ring feed resistor. Based on these sensed values, a threshold voltage for detecting a power cross condition can be adjusted to detect the power cross condition at a lower voltage value.