| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a phase synchronization circuit and a radio communication device which can eradicate a frequency correction error, keep a voltage-to-frequency conversion gain Kvco low, and relax PLL phase noise design. <P>SOLUTION: Calibration unit 190 includes: a counter circuit 191 for counting the frequency of an output oscillation signal of a voltage-controlled oscillator 184; first and second storage circuits 193, 194 for holding the count result of the counter circuit; a comparison circuit 195 for determining which is larger or smaller by comparing the counter circuit with a target frequency; a control circuit 106 for controlling the capacitor bank of the voltage-controlled oscillator comparing the count result of the counter circuit with the result held by the first storage circuit in response to the result of the comparison circuit; a voltage generation circuit 197 for generating calibration voltage and supplies it to the voltage-controlled oscillator; and a processing circuit 198 for performing calculation according to the count result of the counter circuit and the results of the first and second storage circuits, and according to the calculation result, for controlling the voltage generation circuit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
