| 摘要 |
<p>An output driver circuit comprises a plurality of parallel pull up and pull down circuits (30,31,32,41,42,43) each comprising at least one transistor switch (35,51) switchable between on and off states and circuitry (36,50) operable to maintain a desired resistance in the circuit when the transistor switch is switched on, and switch actuating circuitry including time delay circuitry (53,54,55) for effecting a sequence of transistor switching operations in said pull-up and pull-down circuits with a time delay between successive operations, each operation effecting simultaneous switching of a transistor in one pull-up circuit (30) and one pull-down circuit (41), whereby the output impedance is stabilised during a change in signal on the output terminal (15). <IMAGE></p> |
