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. 06, 2021
Filed:
Oct. 24, 2017
Ams International Ag, Rapperswil, CH;
Thomas Froehlich, Ottikon Bei Kemptthal, CH;
Mark Niederberger, Einsiedeln, CH;
Colin Steele, Edinburgh, GB;
Rene Scheuner, Winterthur, CH;
Thomas Christen, Zurich, CH;
Lukas Perktold, Hinwil, CH;
Duy-Dong Pham, Graz, AT;
AMS INTERNATIONAL AG, Rapperswil, CH;
Abstract
A MEMS sensor () comprises a MEMS transducer () being coupled to a MEMS interface circuit (). The MEMS interface circuit () comprises a bias voltage generator (), a differential amplifier (), a capacitor () and a feedback control circuit (). The bias voltage generator () generates a bias voltage (Vbias) for operating the MEMS transducer. The variable capacitor () is connected to one of the input nodes (I) of the differential amplifier (). At least one of the output nodes (A, A) of the differential amplifier is coupled to a base terminal (T) of an output filter () of the bias voltage generator (). Any disturbing signal from the bias voltage generator () is a common-mode signal that is divided equally on the input nodes (I, I) of the differential amplifier () and is therefore rejected.