| 摘要 |
PURPOSE:To facilitate the IC-conversion, and to prevent inductive noise by connecting in parallel a band-pass filter, a low-pass filter and a high-pass filter, executing a compensation of a high frequency by the band-pass filter and determining a characteristic of a middle frequency by the low-pass filter and the high-pass filter. CONSTITUTION:The titled circuit is provided with a band-pass filter 31 formed by being connected so that an output of a first integration circuit 8 is supplied to an input side of a second integration circuit 13, and also, each output of the first and second integration circuits 8, 13 is brought to negative feedback to an input side of the first integration circuit 8, a low-pass filter 33 formed by being connected so that an output of a third integration circuit 17 is brought to negative feedback to its input side, and a high-pass filter 34 formed by being connected so that an output of its low-pass filter 33 is subtracted from an input to the low-pass filter 33. In this state, the compensation of a high frequency is executed by the band-pass filter 31, and a characteristic of a middle frequency is determined by the low-pass filter 33 and the high-pass filter 34. In such a way, the IC-conversion is facilitated, and the inductive noise can be eliminated. |
