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. 16, 2004
Filed:
Dec. 20, 2002
Willem Johannes Kindt, Sunnyvale, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A differential voltage amplifier includes a dynamic level shifter circuit and an amplifier circuit. The dynamic level shifter circuit includes high-impedance current sources and resistors that are arranged to move the common-mode levels of a differential input signal to a signal level that is suitable for the amplifier circuit. The amplifier circuit may be single-ended or differential. The dynamic level shifter circuit may include one or more current sources that are arranged to provide improved performance for low common-mode levels. A dynamic biasing scheme may be employed to improve operation over varied common-mode ranges. A trimming circuit may be used to adjust offsets in the system. A DC chop arrangement may be employed to remove offsets in the system.