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:
Sep. 09, 2008
Filed:
Dec. 16, 2004
Daniel Gudmundson, Austin, TX (US);
Ahsan Habib Chowdury, Austin, TX (US);
James A. Antone, Austin, TX (US);
Rahul Singh, Austin, TX (US);
Daniel Gudmundson, Austin, TX (US);
Ahsan Habib Chowdury, Austin, TX (US);
James A. Antone, Austin, TX (US);
Rahul Singh, Austin, TX (US);
Cirrus Logic, Inc., Austin, TX (US);
Abstract
A system in which drooping of the video levels due to leakage currents and proper DC bias level is addressed by providing a charge into the video signal to offset the leakage currents and to provide DC bias. To determine the leakage current level, measurements are made measuring the voltages of the syncs and the blanking intervals. To determine the DC bias, a measurement is made of the sync. Over a series of video lines these measurements are averaged. If the average is below the desired level, a charge is provided via a current source to the incoming signal. By having the current source provide charge during each video line, droop is reduced and the proper DC bias is provided.