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:
Jan. 24, 2017
Filed:
Oct. 23, 2014
Applicant:
Keithley Instruments, Inc., Cleveland, OH (US);
Inventor:
Gregory Sobolewski, Brecksville, OH (US);
Assignee:
KEITHLEY INSTRUMENTS, INC., Cleveland, OH (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01R 27/02 (2006.01); H01P 5/04 (2006.01); H03H 7/46 (2006.01); H01P 5/00 (2006.01); G01R 31/28 (2006.01); G01R 19/00 (2006.01); H01P 1/20 (2006.01); H03H 7/01 (2006.01);
U.S. Cl.
CPC ...
H03H 7/465 (2013.01); G01R 19/00 (2013.01); G01R 27/025 (2013.01); G01R 31/2822 (2013.01); H01P 5/00 (2013.01); H03H 7/46 (2013.01); G01R 19/0015 (2013.01); G01R 31/2889 (2013.01); H01P 1/2007 (2013.01); H03H 7/0123 (2013.01);
Abstract
Bias tees, according to certain embodiments of the present invention, include switches in the AC signal path, the DC signal path, or both, to improve the capability of the bias tees to be used for high impedance AC measurement, low current DC measurement, or both. Optical control of the switches, as well as control of the switches using a DC bias present within the AC signal input to the bias tee, is described. Including a set of diodes into the DC signal path, rather than a switch, provides enhanced capability of the bias tee to be used for high impedance AC measurements.