摘要 |
<p>A first invertor amplifier (3) is connected across a voltage rail, with a series input resistance (10) and parallel capacitor (11). The output connection of the amplifier (4) passes to a resistor (12) and parallel capacitor to earth (13), then to the second invertor amplifier. Each invertor amplifier has the same voltage switching level, so that any differences in the rise and fall times of the voltage response compensate each other.</p> |