| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a voltage controlled oscillator capable of stably outputting even a low-frequency oscillation signal, and to provide a PLL circuit. <P>SOLUTION: A voltage controlled oscillator 11 according to the present invention comprises an LC resonance circuit 2 including an inductor 4 and a variable capacitor 5 and a plurality of negative resistance circuits NR1, NR2, ..., NRn. The negative resistance circuits NR1, NR2, ..., NRn are configured to be connected with a ground line via constant current sources CG1, CG2, ..., CGn, respectively, each of the constant current sources is configured to control switching between a conducted state (during which a constant current flows) and a non-conducted state (opened state) individually, respectively, and the voltage controlled oscillator 1 according to the present invention is configured to comprise a control means 7 for performing conduction control on the constant current sources. <P>COPYRIGHT: (C)2008,JPO&INPIT |
