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. 21, 2019
Filed:
Jan. 17, 2018
Applicant:
Robert Bosch Gmbh, Stuttgart, DE;
Inventors:
Matthew A. Zeleznik, Pittsburgh, PA (US);
Anthony T. Zisko, Pittsburgh, PA (US);
Assignees:
Akustica, Inc., Pittsburgh, PA (US);
Robert Bosch GmbH, Stuttgart, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/345 (2006.01); G01R 19/00 (2006.01); G01D 5/24 (2006.01); H03F 1/26 (2006.01);
U.S. Cl.
CPC ...
G01R 19/0092 (2013.01); G01D 5/24 (2013.01); H03F 1/26 (2013.01); H03F 3/345 (2013.01);
Abstract
A biasing circuit for a capacitive sensor includes a capacitive sensor element configured to produce a sensor voltage at a sense node, and a preamplifier connected to the sense node and configured to amplify the sensor voltage. The biasing circuit has an auxiliary amplifier connected between an output of the preamplifier and the sense node and configured to set a DC component of an input voltage for the preamplifier to a ratiometric DC bias voltage.