| 摘要 |
PROBLEM TO BE SOLVED: To obtain an analog input device which can be improved in input/output characteristics.SOLUTION: An operational amplifier circuit 5 is connected to the secondary side of a first insulating transformer 1 and amplifies an output voltage of the first insulating transformer 1. An offset voltage adjustment circuit 7 monitors an offset voltage on the input side of the operational amplifier circuit 5 and corrects the offset voltage to zero potential on the basis of a control pulse from control means 12. Thereafter, a drive pulse is outputted from the control means 12, and an analog signal is inputted to the first insulating transformer 1 via a switching element 2. |
