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Title:
HIGH RESOLUTION SIGMA DELTA MODULATOR FOR CAPACITANCE SENSOR TERMINAL DISPLACEMENT MEASUREMENT
Document Type and Number:
WIPO Patent Application WO/2016/149130
Kind Code:
A3
Abstract:
A single plate capacitance sensor includes a sensor capacitor and a reference capacitor that share common plate. A capacitance-to-digital sigma delta modulator provides separate sensor excitation and reference excitation signals to the sensor capacitor and the reference capacitor to provide high resolution detection. Programmable ratio-metric excitation voltages and adaptive excitation voltage sources can be used to enhance modulator performance.

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Inventors:
WANG RONGTAI (US)
SCHULTE JOHN PAUL (US)
Application Number:
PCT/US2016/022140
Publication Date:
December 15, 2016
Filing Date:
March 11, 2016
Export Citation:
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Assignee:
ROSEMOUNT INC (US)
International Classes:
G01R27/26; G01D5/24; H03M3/02
Foreign References:
US20030155936A12003-08-21
US7236113B12007-06-26
US20070236373A12007-10-11
US20050062628A12005-03-24
US6516672B22003-02-11
Other References:
See also references of EP 3268758A4
Attorney, Agent or Firm:
FAIRBAIRN, David, R. et al. (P.A.312 South Third Stree, Minneapolis Minnesota, US)
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