| 摘要 |
A class A driver circuit (30) has an output stage with a plurality of selectable current sources (42). The selectable current sources (42) are used to optimize the drive capability of the output stage of the class A driver circuit (30) for different applications having different output impedance. In one embodiment, the selectable current sources (42) may be selectable, or switchable, using software programmed by a user. In another embodiment, the current sources may be automatically selected, based on sensing the output current provided to a resistive load. Also, in yet another embodiment, the selectable current sources (42) may be selectable based on the input signal of a first stage amplifier (32). A Miller compensation network (40) includes digitally controlled, switchable capacitors (129) and resistors (128), and provides the necessary amount of Miller compensation for the selected current sources.
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