| 摘要 |
There are described an amplifying circuit unit and an amplifying circuit which can momentarily compensate for a d.c. potential offset of a difference output signal stemming from a d.c. potential offset of a difference input signal and achieve a good characteristic. The amplifying circuit unit includes a differential amplifying circuit which receives and amplifies positive-phase and negative-phase signals; a first peak detection circuit for detecting a peak value of the positive-phase signal input to the differential amplifying circuit; a second peak detection circuit for detecting a peak value of the negative-phase signal input to the differential amplifying circuit; and an offset compensation circuit for compensating for a d.c. potential offset arising in a differential signal output from the differential amplifying circuit, on the basis of the peak values detected by the peak detection circuits. <IMAGE> |
