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Transmit-receive switching in wireless hearing aids

  • US 7,512,383 B2
  • Filed: 11/26/2003
  • Issued: 03/31/2009
  • Est. Priority Date: 11/26/2003
  • Status: Expired due to Fees
First Claim
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1. An apparatus for use within a communication system having an antenna circuit with an inductive coil and a tuning capacitor connected to the inductive coil at a node, wherein the communication system further includes an amplifier connected to the node through a DC blocking capacitor to receive an induced signal in the inductive coil in a receive mode, and a driver connected to the antenna circuit to energize the inductive coil with a driven signal in a transmit mode, the apparatus comprising:

  • means to transform the inductive coil, the tuning capacitor and the DC blocking capacitor into a series resonant circuit to reduce an inductive load in the transmit mode; and

    means to transform the inductive coil, the tuning capacitor and the DC blocking capacitor into a parallel resonant circuit to increase an inductive load in the receive mode.

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