Voltage-controlled oscillator
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专利名称：Voltage-controlled oscillator 发明人：Hideo Sugawara
申请号：US07/754826
申请日：19910904
公开号：US05130675A
公开日：
19920714
专利内容由知识产权出版社提供
摘要：A voltage-controlled oscillator according to the present invention comprises: a transistor, where the drain electrode is grounded, the gate electrode is connected to a resonator whose resonant frequency is adjustable according to a voltage applied to a voltage-dependent capacitance diode electromagnetically coupled with the resonator, an output signal is output from the source electrode; a resistor connected in gate bias circuit or source voltage supply circuit for detecting a low- frequency noise component generated in the transistor, where the detected low-frequency noise component is amplified and fed back to the voltage- dependent capacitance diode so as to cancel a phase-noise component generated in the voltage-controlled oscillator. The above-described voltage-controlled oscillator may be further provided with a reference crystal oscillator to which the voltage-controlled oscillator is phase- locked. Thus, a microwave voltage-controlled oscillator excellent in phase-noise characteristics of the oscillated frequency is accomplished though there is employed a GaAs FET which is not good in a low-frequency noise characteristic.
申请人：FUJITSU LIMITED
代理机构：Armstrong & Kubovcik
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