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Electromagnetic sensing and detection of ingestible event markers

  • US 10,187,121 B2
  • Filed: 07/24/2017
  • Issued: 01/22/2019
  • Est. Priority Date: 07/22/2016
  • Status: Active Grant
First Claim
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1. An electronic device comprising:

  • a control device;

    a driver circuit coupled to the control device, the driver circuit configured to alter conductance and comprising;

    cross-coupled transistors; and

    a capacitor coupled between drains of the cross-coupled transistors;

    a partial power source coupled to the control device, wherein the partial power source is configured to provide a voltage potential difference to the control device and the driver circuit as a result of the partial power source being in contact with a conductive fluid, the partial power source comprising;

    a first material electrically coupled to the control device; and

    a second material electrically coupled to the control device and electrically isolated from the first material; and

    an inductor coupled to the driver circuit, wherein the driver circuit is configured to develop a current through the inductor, wherein the inductor is coupled between the drains of the cross-coupled transistors, and wherein a magnitude of the current developed through the inductor is varied to produce an encoded signal that is remotely detectable by a receiver.

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