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热词
    • 4. 发明授权
    • Signal detection circuit for optical disk
    • 光盘信号检测电路
    • US06765855B1
    • 2004-07-20
    • US09588296
    • 2000-06-07
    • Yasushi AdachiKazuhiro OkamotoYutaka OnoguchiMasaaki Katoh
    • Yasushi AdachiKazuhiro OkamotoYutaka OnoguchiMasaaki Katoh
    • G11B509
    • G11B20/10009G11B20/18
    • In a signal detection circuit for an optical disk, a comparator converts an analog HF signal into a digital HF signal by using a slice level. A dropout detection circuit detects a dropout of the digital HF signal. A charge-pump circuit feeds back a slice-level control voltage to the comparator based on a result of the detection by the dropout detection circuit. A voltage follower holds and outputs a voltage stored in the capacitor. A switch is turned OFF when a dropout signal has been detected, and outputs to the voltage follower the voltage that has been stored in the capacitor during an ON state of the switch. A second switch is turned ON when a dropout signal has been detected, and applies an output of the voltage follower to the comparator.
    • 在光盘的信号检测电路中,比较器通过使用限幅电平将模拟HF信号转换为数字HF信号。 压差检测电路检测数字HF信号的丢失。 电荷泵电路基于通过压差检测电路的检测结果将片级控制电压反馈到比较器。 电压跟随器保持并输出存储在电容器中的电压。 当检测到压差信号时,开关断开,并且在开关的ON状态期间向电压跟随器输出已经存储在电容器中的电压。 当检测到压差信号时,第二开关导通,并将电压跟随器的输出施加到比较器。