| 摘要 |
PROBLEM TO BE SOLVED: To provide a phase lock oscillation circuit that can correct an error that cannot sufficiently be corrected by a preset correction amount by a control loop on the occurrence of the error in a phase and a frequency due to an external noise or the like. SOLUTION: An offset correction circuit 16 is used to generate a correction signal on the basis of a reference clock and a PFC(Phase Frequency Comparator) 11, a phase correction control circuit 17 controls an LPF 13 to correct a phase offset and a frequency correction control circuit 18 controls a VCO 14 to correct a frequency offset so as to prevent an output signal with a phase and a frequency being different from those of an output signal substantially set from being oscillated from the VCO 14. |
