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:
Oct. 31, 2006
Filed:
Jul. 27, 2004
Wolfgang Steinhagen, Mauern, DE;
Wolfgang Steinhagen, Mauern, DE;
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A CMOS analog switch is provided that can handle negative input polarity. The semiconductor substrate wherein the analog switch is formed has a substrate area of n-conductivity type. First and second p-channel transistors are formed in the n-conductivity substrate area and each have a gate, a source connected to the input terminal and a drain connected to the output terminal. The analog switch further has a comparator for comparing a voltage level at the input terminal with ground level, a switch driven by an output of the comparator to selectively connect the n-conductivity area with the signal input terminal for a positive input voltage level or to ground for a negative input voltage level, and control circuitry providing gate control signals for the first and second p-channel transistors. The inherent substrate diodes are effectively kept from becoming conductive.