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Offset rejection electrodes

  • US 10,295,558 B2
  • Filed: 05/31/2017
  • Issued: 05/21/2019
  • Est. Priority Date: 05/15/2015
  • Status: Active Grant
First Claim
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1. A Microelectromechanical System (MEMS) sensor comprising:

  • a first plurality of sensing elements positioned on a surface forming a sensing reference plane;

    an anchor coupled to the surface;

    a proof mass coupled to the anchor, wherein the proof mass moves under an external excitation;

    wherein the first plurality of sensing elements is configured to detect motion normal to the sensing reference plane, wherein the first plurality of sensing elements comprises positive and negative electrodes, and wherein an axis line formed between the first plurality of sensing elements is a straight line that goes through a center of the anchor, and wherein the axis line forms a first sensing elements section and a second sensing elements section from the first plurality of sensing elements, wherein a symmetrical correlation between the first sensing elements section and the second sensing elements section is nonzero, and wherein the symmetrical correlation is based on a polarity of sensing elements within each section, and wherein the symmetrical correlation is further based on an area of each sensing element within each section, and wherein the symmetrical correlation is further based on a distance of each sensing element within each section to the axis line; and

    a signal processing circuit configured to combine electrical charges generated by the first plurality of sensing elements to provide an output that is proportional to the external excitation.

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