Low-noise voltage-controlled oscillating circuit

专利名称：Low-noise voltage-controlled oscillating

circuit

发明人：Yasuo Kitayama,Hiroyuki Demura申请号：US12801421申请日：20100608

公开号：US201003029A1公开日：20101209

专利附图：

摘要：A low noise voltage-controlled oscillating circuit which can remove a powersource noise to improve low frequency noise characteristics is disclosed. A capacitor C isprovided between a base of a driving transistor Q and GND, whereby a low frequency

noise input into the base can be removed. As the driving transistor Q, a transistor having alow hFE is used, whereby the low frequency noise input from a power source can beremoved. A coil L is provided on the emitter side of an oscillating transistor Q, wherebybroadband frequency characteristics can be obtained to improve phase noise frequencycharacteristics. On the emitter side of the oscillating transistor Q, a resonance frequencyin a resonant circuit having a capacitor C and the coil L is set near the center of a VCOoscillation frequency band, whereby it is possible to obtain the oscillation frequencywhich is not easily influenced by the noise.

申请人：Yasuo Kitayama,Hiroyuki Demura

地址：Chitose JP,Chitose JP

国籍：JP,JP

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