| 摘要 |
For use in a regulator, a driver (200) has a first transistor pair (203, 204) for alternatively pulling a drive line (OUT, 196) to magnitudes in a limited magnitude range between first and second reference lines (191, 192) depending on an input signal (IN, 195). Parallel to the first pair (203, 204), a second transistor pair (212, 210) alternatively pulls the drive line (OUT, 196) substantially to the reference lines (191, 192). The second pair (212, 210) is controlled by a comparator arrangement (120, 130) comparing the input signal to first (REF-1) and second (REF-2) reference signals and activating the second pair (212, 210) substantially only when the signal (OUT) on the drive line (196) driven by the first pair reaches a magnitude limit. The transistors (203, 204) of the first pair are arranged as emitter followers and the transistors (212, 210) of the second pair are arranged as switched current sources.
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