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:
Oct. 10, 2006
Filed:
Jul. 31, 2003
Glenn Wood, Colorado Springs, CO (US);
Glenn Wood, Colorado Springs, CO (US);
Agilent Technologies, Inc., Palo Alto, CA (US);
Abstract
An electrical circuit detects a 'squelch,' or 'out-of-band,' state of a differential signal pair having a positive (“p”) signal line and a negative (“n”) signal line. In one embodiment of the invention, a first and a second comparator each have positive inputs driven by the positive and negative signal lines, respectively. The negative inputs of the comparators are driven by the outputs of separate digital-to-analog converters (DACs) which are set to a lower squelch threshold voltage. The outputs of the comparators then drive the inputs of a logical AND gate, the output of which indicates the current squelch state of the differential signal pair.