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. 03, 2005
Filed:
Feb. 16, 2001
Applicants:
Moritz Lechner, Zürich, CH;
Andreas Martin Haeberli, Wetzikon, CH;
Inventors:
Moritz Lechner, Zürich, CH;
Andreas Martin Haeberli, Wetzikon, CH;
Assignee:
Sensirion AG, Zürich, CH;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R027/02 ; G01N027/02 ;
U.S. Cl.
CPC ...
Abstract
A sensor for determining at least one parameter with a sigma-delta converter () comprises switched input capacitors and feedback capacitors (CfCfCrefcCrefcCreffCreffCrtCrtCrCrCtempCtempCsCs). At least one of the capacitors is designed such that its capacitance depends on the parameter to be determined. In this way, the change of capacitance can be directly determined by means of the sigma-delta converter. Due to a symmetric design of the converter a higher accuracy can be reached.