| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage-controlled oscillator which can easily be integrated in an IC and can reduce noise. SOLUTION: The voltage-controlled oscillator includes resistances R1 and R2, a feedback circuit of a cross-coupled pair of transistors M1 and M2 for oscillation, varactor diodes D1 and D2, and bias circuits M4 and M5 which apply a fixed bias voltage to the varactor diodes D1 and D2. The voltage-controlled oscillator is constituted without using the inductor which is not suitable for IC implementation and without using a constant-current source which is apt to generate large current noise by making it possible to control the oscillation frequency by varying capacity values of the varactor diodes D1 and D2 with a tuning voltage V<SB>T</SB>. COPYRIGHT: (C)2008,JPO&INPIT
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