| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of external parts in the case of catching a 1st input, whose frequency is different for each frequency mode while keeping optimum transient response characteristics and stability for each frequency. SOLUTION: A gain (KIC) of 1st phase comparing means 2 at a 1st phase locked loop(PLL) circuit part 22 and equivalent serial resistance (RLPF) of active filtering means 25 for generating a 1st control input S17 corresponding to the compared result of 1st phase comparing means 2 and applying that input to a 1st voltage controlled oscillating means 3 are controlled by a control output S13 generated by a 2nd PLL circuit part 23, to which only one filtering means 31 is connected, corresponding to the frequency of 1st input S11. |
