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. 26, 2009
Filed:
Oct. 25, 2007
Robert Karl Butler, Issaquah, WA (US);
Robert Karl Butler, Issaquah, WA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A system, apparatus and method are arranged for monitoring an input signal for a line driver and determining if a valid data signal is present. When the input signal is determined to be an invalid data signal, an offset is introduced into the input stage of the line driver to prevent noise induced toggling of the output of the line driver. When the input signal is determined to be a valid data signal, the offset is removed from the input stage since inclusion of the offset can introduce undesirable duty cycle distortion in the output of the line driver. By dynamically adding or removing the offset from the input stage of the line driver, invalid signals are prevented from toggling the output of the line driver while preserving a clean data transmission for valid signals.