| 摘要 |
A collector of a transistor Q3 to a base of which an amplifier signal Sa generated from the differential amplifier is input is connected with one end of the resistive element RC1 and one end of a resistive element RC2. Other ends of the resistive element RC1 and RC2 are connected with a power source level Vcc and a base of the transistor Q3, respectively. When the emitter of the transistor Q3 is shorted to a ground level GND, for example, in case that a capacitive element CP is not charged enough, the electric potential of the collector of the transistor Q3 is lowered, and the electric potential of the base of the transistor Q3 is also lowered. Accordingly, inflow of the excess current to the transistor Q3 can be prevented.
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