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:
Jun. 03, 2014
Filed:
Mar. 14, 2013
Linear Technology Corporation, Milpitas, CA (US);
Thomas Lloyd Botker, Andover, MA (US);
Linear Technology Corporation, Milpitas, CA (US);
Abstract
A method of fabricating an instrumentation amplifier to have an improved common mode rejection ratio (CMRR) vs. frequency initially trims resistors in the input amplifiers of the instrumentation amplifier during a DC test, where the inputs are shorted and a DC voltage is applied, so that the output of the amplifier is approximately zero. This will normally cause the transconductances of the two input amplifiers to be different. Thus, the AC CMRR will degrade with frequency. Trimmable capacitors are provided in the input section and are trimmed during a common mode AC test to cause the output voltage to be minimized during the AC test. This causes the two input amplifiers to have the same bandwidth and gm/C ratio.