| 摘要 |
A current mirror circuit includes a current input terminal; a first FET and a second FET, each having a gate terminal, a drain terminal, and a source terminal, the gate terminal of the first FET being connected to the gate terminal of the second FET; a third FET having a source terminal connected to the drain terminal of the first FET, and a drain terminal and a gate terminal connected to each other and to the current input terminal; and a fourth FET having a source terminal connected to the drain terminal of the second FET, a gate terminal connected to the gate terminal of the third FET, and a drain terminal serving as a current output terminal. Therefore, even when the output voltage varies, since the current is almost constant, the circuit is not adversely affected by the variation in the output voltage. As a result, error in the output current in response to variations in the output voltage is significantly reduced.
|
