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:
Mar. 22, 2005
Filed:
Jul. 16, 2001
Peyman Hojabri, San Jose, CA (US);
Peyman Hojabri, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An integrated circuit with a signal demultiplexor for separating out two signals of different magnitudes from within a multiplexed signal without requiring a large capacitance for signal filtering. A multiple-threshold input comparator stage separates the multiplexed input signal into a first fully demultiplexed signal and a first partially demultiplexed signal. The first fully and partially demultiplexed signals are logically processed in an Exclusive-OR gate to produce a second partially demultiplexed signal which is then time-delayed and gated by the first fully demultiplexed signal. The resultant gated signal is low pass filtered to produce a second fully demultiplexed signal. In a video signal application, the multiplexed input signal would be a 'sandcastle' signal containing both horizontal clamp and vertical synchronization signals, with the horizontal clamp signal component being greater in magnitude than the vertical synchronization signal component, and the resulting first and second fully demultiplexed signals would be the separated horizontal clamp and vertical synchronization signals, respectively.