| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To increase a variable amount of resonance capacitance and to extend an oscillation frequency range by equivalently reducing the capacitance value of fixed capacitance out of the resonance capacitance value of a voltage controlled oscillator. <P>SOLUTION: The voltage controlled oscillator is provided with: a differential negative conductance generation circuit 11 having resonance nodes OUT, OUTB for differential outputs; a differential resonance circuit 10 in which variable capacitance whose capacitance value is controlled by voltage control and inductance are connected in parallel; and a differential negative impedance circuit 13. The resonance circuit 10 and the negative impedance circuit 13 are connected between the resonance nodes OUT, OUTB. The capacitance value of the fixed capacitance which is generated between the the resonance nodes OUT, OUTB is reduced by negative impedance taken by the negative impedance circuit 13. The fixed capacitance is represented by floating capacitance generated between the resonance node OUT and ground potential and between the resonance node OUTB and the ground potential. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
