| 摘要 |
PURPOSE:To attain steep change in a generated DC voltage together with the reduction in the settling time of a filter by connecting a means generating nearly equal DC voltage to a DC component of an input signal to an AC ground terminal. CONSTITUTION:A terminal 14 of a low-pass filter 6 is not connected to ground but connected to a point having a voltage Vapprox close always to an output voltage Vout. Even when a DC voltage has a change at an input terminal 16, it is not required to charge or discharge various capacitors of the filters com pletely. Thus, the capacitors have only to be charged again for the difference in value between terminals 16 and 14 and the difference can be made very slight and easily attained with respect to the Vout. Thus, the value of time constant required to reach a desired setting time is very small.
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