Title:
SCHEME TO ACHIEVE ROBUSTNESS TO ELECTROMAGNETIC INTERFERENCE IN INERTIAL SENSORS
Document Type and Number:
WIPO Patent Application WO/2014/016689
Kind Code:
A3
Abstract:
A capacitive sensor system and method resistant to electromagnetic interference is disclosed. The system includes a capacitive core, differential amplifier with inverting and non- inverting inputs, capacitive paths, and chopping system. Core can include inputs and outputs coupled to variable capacitors, and common nodes coupling variable capacitors. Capacitive paths couple core outputs to amplifier inputs. When chopping system is high, one polarity voltage is applied to core inputs, a first core output is coupled to the inverting input and a second core output is coupled to the non-inverting input. When the chopping system is low, opposite polarity voltage is applied to core inputs, and core output to amplifier input couplings are flipped. Capacitive paths can include bond wires. Chopping system can be varied between high and low at frequencies that smear noise away from a frequency band of interest, or that smear noise substantially evenly across a wide frequency range.
More Like This:
Inventors:
BALACHANDRAN GANESH (US)
PETKOV VLADIMIR (US)
PETKOV VLADIMIR (US)
Application Number:
PCT/IB2013/002079
Publication Date:
March 13, 2014
Filing Date:
July 25, 2013
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
International Classes:
G01D5/241; G01P15/08; G01P15/125
Domestic Patent References:
| WO2009038924A2 | 2009-03-26 |
Foreign References:
| US20130063207A1 | 2013-03-14 | |||
| US20130063165A1 | 2013-03-14 | |||
| US20070247171A1 | 2007-10-25 |
Download PDF: