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:
Apr. 18, 2017
Filed:
Mar. 13, 2015
Applicant:
Rosemount Inc., Shakopee, MN (US);
Inventors:
Rongtai Wang, Eden Prairie, MN (US);
John Paul Schulte, Eden Prairie, MN (US);
Assignee:
Rosemount Inc., Shakopee, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01L 9/12 (2006.01); H03M 3/00 (2006.01); G01D 5/24 (2006.01);
U.S. Cl.
CPC ...
H03M 3/39 (2013.01); G01D 5/24 (2013.01); G01L 9/12 (2013.01); H03M 3/494 (2013.01); H03M 3/356 (2013.01); H03M 3/376 (2013.01);
Abstract
A single plate capacitance sensor includes a sensor capacitor and a reference capacitor that share common plate. A capacitance-to-digital sigma delta modulator provides separate sensor excitation and reference excitation signals to the sensor capacitor and the reference capacitor to provide high resolution detection. Programmable ratio-metric excitation voltages and adaptive excitation voltage sources can be used to enhance modulator performance.