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Voltage control oscillator having modulation function

  • US 20050270114A1
  • Filed: 08/11/2003
  • Published: 12/08/2005
  • Est. Priority Date: 08/09/2002
  • Status: Active Grant
First Claim
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1. A voltage controlled oscillator with a modulation function, comprising:

  • a first varactor diode;

    a second varactor diode whose anode side is connected to an anode side of the first varactor diode and a ground voltage;

    a third varactor diode whose cathode side is connected to a cathode side of the first varactor diode;

    a fourth varactor diode whose anode side is connected to an anode side of the third varactor diode and whose cathode side is connected to a cathode side of the second varactor diode;

    a first resistor connected between a connection point between the anode sides of the third varactor diode and the fourth varactor diode and a connection point between the anode sides of the first varactor diode and the second varactor diode;

    a modulation current terminal for performing frequency modulation that is connected to the anode sides of the third varactor diode and the fourth varactor diode;

    a second resistor connected between a connection point between the cathode sides of the first varactor diode and the third varactor diode and a voltage input terminal;

    a third resistor connected between a connection point between the cathode sides of the second varactor diode and the fourth varactor diode and the voltage input terminal;

    a first capacitor having a first end connected to a connection point between the cathode sides of the first varactor diode and the third varactor diode;

    a first inductor having a first end connected to a second end of the first capacitor;

    a second capacitor having a first end connected to a connection point between the cathode sides of the second varactor diode and the fourth varactor diode;

    a second inductor having a first end connected to a second end of the second capacitor; and

    a voltage source connected to second ends of the first inductor and the second inductor, wherein a wave that is frequency-modulated is output by controlling a current.

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