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:
May. 09, 2006
Filed:
Aug. 09, 2004
Charles Guan, San Francisco, CA (US);
Charles Guan, San Francisco, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A method and circuit for generating independent top and bottom corner correction using a single fourth order function is described. The top and bottom corner correction signal may be included in an east-west corrected voltage to correct an asymmetry of a picture with respect to a horizontal axis and a vertical axis of the picture. Two switch signals based on a ramping voltage, which is used to sweep an electron beam, and two clock signals control a sample-and-hold circuit. The sample-and-hold circuit is arranged to sample a fourth order voltage during a top portion and a bottom portion of the ramping voltage and provide two independent correction voltages Vand V. The correction voltages are then provided for top and bottom corner correction to the east-west corrected voltage.