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. 25, 2009
Filed:
Jun. 12, 2008
Jeffrey Blackburn, Lakeway, TX (US);
Ajaykumar Kanji, Austin, TX (US);
Jeffrey Blackburn, Lakeway, TX (US);
Ajaykumar Kanji, Austin, TX (US);
Integrated Device Technology, Inc., San Jose, CA (US);
Abstract
An audio system includes a CODEC audio jack having left and right audio ports and a jack sense circuit. The jack sense circuit includes left and right amplifiers and a cross-drive impedance sensing circuit. This cross-drive impedance sensing circuit, which is electrically coupled to the left and right audio ports and the left and right amplifiers, detects the resistances of left and right output loads in order to determine characteristics of a device connected to the CODEC audio jack. The cross-drive impedance circuit is configured to measure a resistance of a left output load electrically coupled to the left audio port, in response to a 'right' test signal generated by the right amplifier, and is further configured to measure a resistance of a right output load electrically coupled to the right audio port in response to a 'left' test signal generated by the left amplifier.