| 摘要 |
PROBLEM TO BE SOLVED: To provide a phase-locked loop circuit that has a short lock time from a dead lock state restored to a locks state. SOLUTION: The phase-locked loop circuit is provided with a reference signal input terminal 1, a phase comparator 2, a charge pump 3, a loop filter 4, a dead lock processing circuit 5, a voltage-controlled oscillator 6, an oscillation output terminal 7, and a frequency divider 8 and switches a control voltage of the voltage-controlled oscillator in a dead locks state from a loop filter output into a dead-lock release voltage. |
