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Semiconductor device

  • US 20080174408A1
  • Filed: 12/20/2007
  • Published: 07/24/2008
  • Est. Priority Date: 12/26/2006
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising an antenna and a chip, the chip comprising:

  • a comparison circuit configured to compare an input voltage supplied through the antenna with a reference voltage and output a voltage in accordance with the input voltage;

    a bias circuit portion configured to receive a modulation signal and a voltage outputted from the comparison circuit and output one or both of the modulation signal and a protection signal; and

    a protection/modulation circuit portion having a switch which operates in accordance with one or both of the modulation signal and the protection signal outputted from the bias circuit portion.

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