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:
Nov. 25, 2003
Filed:
Jun. 12, 2002
Benjamin A. Douts, Tucson, AZ (US);
Thomas L. Botker, Tucson, AZ (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A nulling amplifier ( A) for an auto-zeroed amplifier includes a first differential stage including first ( ) and second ( ) input transistors and a second differential stage including first ( ) and second ( ) nulling transistors coupled to drains of the second and first input transistors and to a folded cascode circuit ( ) coupled to an output stage ( ). A gain boost circuit increases the output impedance of the nulling amplifier. The gm ratios of the first and second input transistors and the first and second nulling transistors have values which establish a predetermined low input-referred noise level in the nulling amplifier, and the gain boost circuit maintains a low offset voltage.