Low-power, high-modulation-index amplifier for use in battery-powered device

  • US 20020032471A1
  • Filed: 08/31/2001
  • Published: 03/14/2002
  • Est. Priority Date: 09/06/2000
  • Status: Active Grant
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First Claim
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1. A low power modulation amplifier circuit adapted to be coupled with an implantable device, comprising:

  • an amplifier having an output port through which a carrier signal is presented to a load, the load including an implantable coil associated with the implantable device;

    a first capacitance connected between the output port of the amplifier and a voltage reference;

    an antenna coil connected to the output port of the amplifier, the antenna coil comprising part of the load to which the carrier signal is presented by the amplifier;

    a resistor connected to the antenna coil; and

    a switch that switchably connects the resistor in circuit relationship with the antenna coil.

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