| 摘要 |
<p>PURPOSE: To provide an active high-based weighting circuit for noise attenuation circuit. CONSTITUTION: This circuit is provided with a capacitor for connecting an input signal to an output terminal 62, distributing means for distributing the voltage of low-frequency component in the input signal at a prescribed level, a 1st voltage/current converting circuit 51 for outputting a 1st current signal in response to the voltage distributed input signal when its is positive, and a 2nd voltage/current converting circuit 52 for outputting a 2nd current signals in response to the voltage distributed input signals when it is negative. Further, this circuit is equipped with a 1st current mirror circuit 75 for outputting a 3rd current signal in response to the 1st current signal, a 2nd current mirror circuit 76 for connecting a 4th current signal to the output terminal in response to the 2nd current signal, and a 3rd current mirror circuit 79 as an active load for connecting a 5th current signal to an output terminal 62. Then, by connecting the output of voltage/current converter through the current mirror circuit 79 to the output terminal 62, circuit configuration can be simplified and mismatchings can be decreased.</p> |
