| 摘要 |
PROBLEM TO BE SOLVED: To prevent the cutoff frequency of a low-pass filter from changing even when a leakage current flows into an overvoltage protection element.SOLUTION: A capacitive load bias circuit comprises: a voltage output circuit 11 which outputs a bias voltage; an overvoltage protection element 12 which is connected between the output side of the voltage output circuit 11 and ground; and a low-pass filter 13 which includes a diode D1 having its anode connected to output side of the voltage output circuit 11 and a capacitor C1 connected between the cathode of the diode D1 and ground. A common connection point between the cathode of the diode D1 and the capacitor C1 of the low-pass filter 13 is connected to an output terminal 14 having a capacitive load connected thereto. |
