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OSCILLATOR CIRCUIT FOR USE IN AN UNTETHERED STYLUS

  • US 20080150917A1
  • Filed: 12/20/2006
  • Published: 06/26/2008
  • Est. Priority Date: 12/20/2006
  • Status: Abandoned Application
First Claim
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1. An untethered stylus configured to cooperate with a location sensing device, the location sensing device configured to generate a continuously varying magnetic drive signal that powers the stylus, the stylus comprising:

  • a housing comprising a tip and a shield;

    an antenna arrangement coupled between the tip and shield, the antenna arrangement comprising a resonant circuit tuned to a frequency of the magnetic drive signal; and

    an oscillator circuit coupled to the antenna arrangement and powered by the antenna arrangement, the oscillator circuit configured to oscillate at a frequency corresponding to data to be communicated from the stylus, the oscillator circuit configured to amplitude modulate a voltage developed at the tip at the oscillator circuit frequency.

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