| 摘要 |
PURPOSE:To shorten the time up to the servo operation at start, by constituting the low pass filter through the use of the lag-lead type filter having the same transfer function as the active filter at servo lock and the buffer of high impedance. CONSTITUTION:The output terminal of the charge-pump 6 is connected to the control terminal of FET82 via the resistor 81. The output terminal of FET82 is grounded via the resistor 83 and connected to the input terminal of the amplifier 8 via the ripple filter 84. Further, the control terminal of FET82 is grounded via the series circuit of the capacitor 85 and the resistor 86. In this circuit, the lag-lead type filter is constituted with the resistors 81, 86 and the capacitor 85, and the buffer amplifier of high input impedance is constituted with FET82 and the resistor 83. |
