Nihon Dempa Kogyo Co., Ltd.

Kietsu Saito

Shunichi Wakamatsu

Yasushi Yamamoto

Kazuo Akaike

Hiroyuki Kukita

Mitsuaki Koyama

Susumu Yoshimoto

Yasunobu Hasegawa

Toshimasa Tsuda

Junichiro Yamakawa

Kenji Kawahata

Tatsunori Onzuka

Hiroshi Hoshigami

Mikio Takano

There is provided a voltage controlled oscillator that is compact and can be manufactured at low cost. The voltage controlled oscillator is structured to include: a resonance part including a variable capacitance element and an inductance element, the variable capacitance element having a capacitance that varies according to a control voltage for frequency control input from an external part, and a series resonant frequency of the resonance part being adjusted according to the capacitance; an amplifying part amplifying a frequency signal from the resonance part; and a feedback part including a capacitance element for feedback and feeding the frequency signal amplified by the amplifying part back to the resonance part to form an oscillation loop together with the amplifying part and the resonance part, wherein the amplifying part is provided in an integrated circuit chip, and the resonance part and the capacitance element for feedback are formed as circuit components separate from the integrated circuit chip. The circuit components are selected according to an oscillation frequency.

Voltage controlled oscillator

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Growing community of inventors

Saitama, Japan

Kietsu Saito