| 摘要 |
Source potentials of n output transistors are fixed by common fixed voltage, and sources are connected to a current output terminal. A drain and a gate of an input transistor are commonly connected to the drains and the gates of the output transistors respectively. A first current-to-voltage conversion unit is connected onto the drain side of the input transistor to convert current Im 2 flowing through the input transistor into voltage Vx 1 . A second current-to-voltage conversion unit converts reference current Iref into voltage Vx 2 . The voltages Vx 1 and Vx 2 are input to a first error amplifier, and the first error amplifier adjusts gate voltages of the input transistor and output transistors. n switches are provided on a path through which output of the first error amplifier reaches the gate of the output transistor. A control unit controls on/off of the switch according to a digital signal.
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