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:
Sep. 30, 2008
Filed:
Nov. 20, 2007
Applicant:
Jens Ullmann, San Jose, CA (US);
Inventor:
Jens Ullmann, San Jose, CA (US);
Assignee:
Qualitau, Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 1/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
A particular configuration of voltage source measurement (VSM) circuitry minimizes common mode errors in measurement of current through a device under test (DUT), even across a wide range of output voltages. The current Iis not affected by common-mode errors, since the current measurement is based on the output voltage of an operational amplifier or a differential amplifier, and the circuit configuration is such that the current measurement is made while the operation amplifier or differential amplifier has very low common-mode input voltage.