Capacitance sensing with mismatch compensation

Details Capacitance sensing with mismatch compensation Capacitance sensing with mismatch compensation

2009-09-30

2011-10-18

Johnson, Ryan (Department: 2817)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S658000, C331S143000, C331S046000

Reexamination Certificate

active

08040143

ABSTRACT:
Systems and methods are provided for determining the value of a capacitance. A system for sensing capacitance comprises an oscillator arrangement comprising a plurality of oscillators and a mismatch compensation arrangement coupled between the oscillator arrangement and a first capacitive element having a first capacitance. The mismatch compensation arrangement is configured to selectively couple the first capacitive element to a respective oscillator of the plurality of oscillators, wherein an oscillation frequency of the respective oscillator is influenced by the first capacitance.

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Ylimaula, M., et al., Monolithic SOI-MEMS Capacitive Pressure Sensor with Standard Bulk CMOS Readout Circuit, Solid-State Circuits Conference, 2003. ESSCIRC '03. Sep. 16-18, 2003, pp. 611-614.
Repas, R., Sensor Sense: Capacitive Touch Sensors, Feb. 2, 2009, Retreived from internet: URL: http://machinedesign.com/article/sensor-sense-capacitive-touch-sensors-0202.

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