Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kia Silverbrook0
Samuel George Mallinson0
Date of Patent
April 14, 2009
0Patent Application Number
120153900
Date Filed
January 16, 2008
0Patent Primary Examiner
Patent abstract
The invention provides for a capacitance sensing circuit for a pressure sensor. The pressure sensor includes a sensor membrane and a compensation membrane. The circuit includes a controller arranged in signal communication with a charge amplifier, a charge injector and two switches. The charge amplifier is connected to the switches via a sensor capacitor in parallel with a reference capacitor in parallel with a parasitic capacitance to ground. The charge injector and charge amplifier are arranged in parallel connection between the capacitors and the controller. The controller operates the circuit to determine a charge imbalance indicative of a pressure difference between the sensor and compensation membranes.
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