Foldback free capacitance-to-digital modulator

Details Foldback free capacitance-to-digital modulator Foldback free capacitance-to-digital modulator

2008-01-15

2008-01-15

Nguyen, Khai M. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S150000, C341S172000, C324S658000, C324S678000, C324S679000, C073S718000, C073S724000

Reexamination Certificate

active

07319421

ABSTRACT:
A capacitance-to-digital (CD) modulator converts capacitance of a differential pressure sensor to a pulse code modulation output signal. The first stage of the CD modulator is a sigma-delta integrator having an auto-zero capacitor connected between an integrator input node and an amplifier input. During an auto-zero phase, a feedback capacitor is connected between the amplifier input and output, and the auto-zero capacitor stores a voltage that is a function of leakage resistance of the sensor capacitor connected to the integrator input node. During an integration phase, the feedback capacitor is connected to the integrator input node. If an overpressure/short circuit condition exists, the stored voltage on the auto-zero capacitor induces a current to flow to the feedback capacitor to drive the integrator to saturation and suppress foldback anomaly.

REFERENCES:
patent: 5057839 (1991-10-01), Koch
patent: 5083091 (1992-01-01), Frick et al.
patent: 5974895 (1999-11-01), Steger et al.
patent: 6140952 (2000-10-01), Gaboury
patent: 6295875 (2001-10-01), Frick et al.
patent: 6356085 (2002-03-01), Ryat et al.
patent: 6509746 (2003-01-01), Wang
patent: 6516672 (2003-02-01), Wang
patent: 6684711 (2004-02-01), Wang
patent: 6744258 (2004-06-01), Ishio et al.
patent: 6834258 (2004-12-01), Schulte et al.
patent: 2006/0213270 (2006-09-01), O'Dowd et al.

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