Capacitance-to-digital interface circuit for differential pressure sensor
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United States of America Patent
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Jan 29, 2008
Grant Date -
Jul 26, 2007
app pub date -
Jan 26, 2006
filing date -
Jan 26, 2006
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Abstract
A two phase, second order capacitance-to-digital (CD) modulator includes a first stage sigma-delta integrator that forms charge packets as a function of sensor capacitance during an auto-zero phase and integrates the packets during an integration phase to produce an output voltage. The first stage integrator holds its output voltage during the auto-zero phase, so that a second stage sigma-delta integrator can sample the first stage output voltage during the auto-zero phase and integrate the sampled voltage during the integration phase.
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