| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of external components by configuring a differential amplifier, such that the differential amplifier generates a differential offset signal onto an output terminal of an amplifier and has an input terminal coupled with the output terminal of the amplifier and a compensation terminal coupled with itself respectively and configuring an offset compensation device with the offset compensation device maintaining the differential offset to a prescribed value. SOLUTION: An offset compensating circuit 104 employs feedback to keep an offset signal at the output terminal of an output driver circuit 110 for a period in a steady-state operation. The offset compensation circuit 104 especially detects the value of the offset signal at the output terminal of the output driver circuit 110, generates a compensation signal on the basis of the value of the offset signal and gives the compensation signal to an amplifier(AMP) 108. The AMP 108, responding to the compensation signal, generates a compensation signal for a steady-state period and gives the signal to the output driver circuit 110, which generates an output offset signal with a prescribed value.
|
