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Apparatus and method for implementing a differential drive amplifier and a coil arrangement

  • US 9,350,303 B2
  • Filed: 05/17/2012
  • Issued: 05/24/2016
  • Est. Priority Date: 12/07/2009
  • Status: Active Grant
First Claim
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1. An apparatus, comprising:

  • a first coil having a planar spiral configuration with a spacing between turns of the first coil increasing from an outer edge of the first coil toward a center of the first coil; and

    a second coil having a planar spiral configuration with a spacing between turns of the second coil increasing from an outer edge of the second coil toward a center of the second coil, wherein the first coil and the second coil are configured to transfer wireless power via a magnetic field to one or more receive coils.

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