Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Samuel George Mallinson0
Kia Silverbrook0
Date of Patent
December 21, 2010
Patent Application Number
12397307
Date Filed
March 3, 2009
Patent Primary Examiner
Patent abstract
A capacitance sensing circuit for a membrane pressure sensor is provided. The sensing circuit has a controller, two switches in signal communication with the controller, a charge amplifier and a charge injector. The charge amplifier is connected to the switches via a sensor capacitor Cs and a reference capacitor Cr. The sensor and reference capacitors are arranged in parallel with one another and a parasitic capacitance Cp to ground. The charge injector and amplifier are arranged in parallel connection between the capacitors and the controller. The controller is configured to determine a charge imbalance indicative of a pressure difference between membranes of the pressure sensor.
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