| 摘要 |
PURPOSE:To transfer a signal with high accuracy even in case when a line resistance is large by constituting so that a current distortion generated by a voltage detector is cancelled by a voltage generator. CONSTITUTION:In a voltage/current converting circuit by a resistance RB and a current mirror 5, a current distortion is generated due to non-linearity of an input resistance of the current mirror 5. A signal current containing this distortion is inputted to a current/voltage converting circuit 9 consisting of a transistor TR9 and the resistance RE through a current mirror 7. A mirror ratio of the current mirrors 5, 7 is all set to ''1'', the resistance RE and RB are set to the same resistance, and when the TR9 and an input TR of the current mirror 5 use those of the same shape, non-linearity of the input of the current mirror 5 and non-linearity between the base and the emitter of the TR9 become almost equal, therefore, the current distortion generated by the current mirror 5 is cancelled by the TR9. The same way is formed between a current mirror 6 and a TR8, as well. |
