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Oscillator circuit having a stable output signal resistant to power supply voltage fluctuation

  • US 7,663,447 B2
  • Filed: 10/19/2007
  • Issued: 02/16/2010
  • Est. Priority Date: 10/31/2006
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising:

  • a voltage controlled oscillator circuit having a first voltage terminal, a second voltage terminal and an output terminal configured to output a clock signal;

    an antenna circuit configured to transmit and receive a signal;

    a rectifier circuit configured to generate a power supply voltage between the first voltage terminal and the second voltage terminal from the signal;

    a control circuit electrically connected between the first voltage terminal and the second voltage terminal, and configured so that a potential difference between the first voltage terminal and a control terminal of the control circuit remains constant;

    a first transistor having;

    a first gate electrode electrically connected to an input terminal of the voltage controlled oscillator circuit;

    a first source region electrically connected to the second voltage terminal; and

    a first drain region electrically connected to the first gate electrode; and

    a second transistor having;

    a second gate electrode electrically connected to the control terminal of the control circuit;

    a second source region electrically connected to the first voltage terminal; and

    a second drain region electrically connected to the first drain region.

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