Linearizer circuit
AssigneeMicro Analog Systems Oy
InventorEsa Sihvola
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Abstract
A linearizer circuit which corrects inherent nonlinearity of a capacitive pressure sensor is provided. The linearizer is based on an operational amplifier configuration including a feedback network of switched capacitor type that is switched between a first switching phase and a second switching phase .In this switched capacitor configuration, DC gain of the operational amplifier configuration in the second switching phase can be adapted to realize a linearization function required to substantially linearize a non-linear capacitance-pressure characteristic of a capacitive pressure sensor when the capacitive pressure sensor is connected to be part of the feedback network.
Claims14
A linearizer circuit for a capacitive pressure sensor, comprising:
- an operational amplifier, and
- a feedback network of switched capacitor type controlled by clock phases between a first switching phase and a second switching phase so that dc gain of the operational amplifier configuration from a switching capacitor configuration in the second switching phase is adapted to realize a linearization function required to substantially linearize a non-linear capacitance-pressure characteristic of a capacitive pressure sensor when the capacitive pressure sensor is connected to be part of the feedback network.
Dependencies are inferred from the claim text.