| 摘要 |
<p>A filter circuit which operates as a substantially optimum integrating circuit can be realized by means of a differential amplifier, a (-) input of which is connected to the amplifier's output via a seriesarrangement comprising a first resistor and a first capacitor, a (+) input of the amplifier being connected directly, and the output being connected via a seriesarrangement of a second resistor and a second capacitor to a terminal carrying a reference voltage. The junction of the second resistor and second capacitor constitute an output terminal of the filter circuit. The time constant of the first capacitor and the first resistor is substantially equal to the time constant of the second capacitor and the second resistor. The capacitance values and the resistance values may, for example, be equal.</p> |
