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Semiconductor device

  • US 8,284,579 B2
  • Filed: 09/03/2009
  • Issued: 10/09/2012
  • Est. Priority Date: 09/17/2008
  • Status: Expired due to Fees
First Claim
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1. A semiconductor device comprising:

  • an antennaan input circuit configured to generate a DC voltage from an Ac signal supplied from the antenna;

    a filter;

    a circuit for generating a constant voltage configured to generate the constant voltage from the DC voltage supplied through the filter;

    a circuit portion comprising a memory; and

    a feedback circuit configured to change impedance of the semiconductor device in accordance with the constant voltage,wherein the constant voltage is supplied to the circuit portion and the feedback circuit from the circuit for generating the constant voltage,wherein the input circuit is directly connected to the antenna, andwherein the feedback circuit is directly connected to the antenna.

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