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Non-Contact Biopotential Sensor

  • US 20110043225A1
  • Filed: 11/26/2008
  • Published: 02/24/2011
  • Est. Priority Date: 11/28/2007
  • Status: Active Grant
First Claim
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1. A sensor for measuring an electric field, said system comprising:

  • a sensing plate capacitively coupled to a body surface, wherein changes in electrical potential at the body surface generates an electric field that induces change in the electric potential of the sensing plate, the sensing plate including a sensing node positioned in the electric field for generating an input signal from the electric field, the sensing plate separated from the body surface by an intervening material;

    an amplifier configured to amplify the input signal, the amplifier having an input port and an output port, the amplifier configured to receive the input signal at the input port and to generate an amplified output signal at the output port; and

    a switching circuit connected to the input port and a reference voltage, the switching circuit configured to non-continuously close a shunting path from the sensing node to the reference voltage to reset the sensing node connected to the input port.

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