Capacitive position encoder
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United States of America Patent
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Aug 23, 2016
Grant Date -
May 22, 2014
app pub date -
Oct 18, 2013
filing date -
Nov 19, 2012
priority date (Note) -
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Abstract
The invention relates to a capacitive position encoder (1), comprising at least one capacitor with a first capacitor plate and a second capacitor plate, a dielectric modulator that is movably arranged between said first capacitor plate and said second capacitor plate, a signal source (11) for providing a phase-shifted excitation signal to the first capacitor plate of said at least one capacitor, and a charge amplifier (20) that is electrically connected to the second capacitor plate of said at least one capacitor, wherein a feedback loop (21) of the charge amplifier (20) comprises a feedback capacitor (Cf), wherein the capacitive position encoder (1) also comprises a shock cancellation circuit (30) that forms a parallel circuit with the feedback loop (21) including the feedback capacitor (Cf) and that the shock cancellation circuit (30) comprises a low pass filter (31).
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