Capacitance-to-digital interface circuit for differential...

Details Capacitance-to-digital interface circuit for differential... Capacitance-to-digital interface circuit for differential...

2008-01-29

2008-01-29

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S172000, C324S658000, C324S678000, C324S679000, C073S718000, C073S724000

Reexamination Certificate

active

11339890

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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