| 摘要 |
PROBLEM TO BE SOLVED: To provide a charging pump which does not require giving very short impulses to a ring filter and an oscillator. SOLUTION: A phase detector (1) of the phase-locked loop gives 1st and 2nd impulses to a charge pump (2) periodically, the impulses have an emission time, depending on a phase ratio of input signals of the phase-locked loop and ring filters (3a, 3b) respectively control increase or decrease in the circuit output. The charging pump 2 is a loop (21, 22, 23, 24, 28), converts the 1st and 2nd impulses into 1st and 2nd voltage signals with a longer duration than the maximum impulse duration and characteristic values, whose difference depends on a phase ratio of the loop input signals and generates a signal with a current denoting this difference.
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