VOLTAGE CONTROLLED OSCILLATOR AND COMMUNICATION UNIT USING THE SAME

PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator capable of realizing stable oscillation in a wide frequency range, and to provide a communication unit using the oscillator. SOLUTION: The voltage controlled oscillator 10 is provided with a resonance circuit 1 and an oscillation circu...

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Bibliographic Details
Main Authors HAYAFUJI HISAO, ARAMATA TOMOHIDE
Format Patent
LanguageEnglish
Published 30.08.2002
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
GENERATION OF NOISE BY SUCH CIRCUITS
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER
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Summary:PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator capable of realizing stable oscillation in a wide frequency range, and to provide a communication unit using the oscillator. SOLUTION: The voltage controlled oscillator 10 is provided with a resonance circuit 1 and an oscillation circuit 11. The oscillation circuit 11 is provided with an oscillation transistor Q11, resistances R11-R14, a capacitor C11, and a second variable capacity diode VD11. The emitter of the oscillation transistor Q11 is connected to an output terminal 4, and grounded through a parallel circuit constituted of the second variable capacity diode VD11 and a resistance R12. Also, the cathode of the second variable capacity diode VD11 is connected through a resistance R14 to a control circuit 3 of the resonance circuit 1.
Bibliography:Application Number: JP20010046569