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Electronic devices with capacitive proximity sensors for proximity-based radio-frequency power control

  • US 8,947,305 B2
  • Filed: 04/26/2013
  • Issued: 02/03/2015
  • Est. Priority Date: 07/17/2009
  • Status: Active Grant
First Claim
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1. An electronic device comprising:

  • a housing;

    an antenna window in the housing;

    metal structures that serve as an antenna resonating element and a capacitive proximity sensor electrode, wherein the metal structures are configured to transmit radio-frequency signals through the antenna window;

    a capacitance-to-digital converter coupled to the metal structures; and

    a plurality of radio-frequency choke inductors coupled between the metal structures and the capacitance-to-digital converter, wherein the capacitance-to-digital converter has first and second inputs, a first radio-frequency choke inductor of the plurality of radio-frequency choke inductors is coupled between the metal structures and the first input, and a second radio-frequency choke inductor of the plurality of radio-frequency choke inductors is coupled between the metal structures and the second input.

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