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. 08, 2007
Filed:
Aug. 17, 2005
Christopher G. Regier, Austin, TX (US);
Christopher G. Regier, Austin, TX (US);
National Instruments Corporation, Austin, TX (US);
Abstract
In one embodiment, a programmable gain instrumentation amplifier comprises an input stage configured with a differential precision current conveyor circuit. The current conveyor circuit may be implemented with operational amplifiers coupled to gain-setting resistors, with double-multiplexers configured on each end of the gain-setting resistors. In a first set of embodiments, the double-multiplexers may be bootstrapped, whereby the power supplies of each double-multiplexer may track the signals on the output pin of a respective sense-multiplexer component of the double-multiplexer. In a second set of embodiments, the power supplies may alternatively track the op-amp differential output during non-overload conditions, or the op-amp common-mode output at a gain resistor center tap during overload conditions. Corresponding bootstrap circuits may be designed for both sets of embodiments, the bootstrap circuits coupling to the respective tracking node or nodes in either case.