| 摘要 |
An amplifier (100) includes an output node (114) having an output voltage (Vout), and a switching amplifier (104) having a first output (132) coupled to the output node for delivering a switching amplifier output current (ISW) to the output node. The amplifier further includes a modulator (136) coupled to the switching amplifier for controlling the switching amplifier, and a linear amplifier (102) producing a linear amplifier output current (Ilin) through a second output (118) coupled to the output node. The amplifier also includes a feedback network (106) coupled to the modulator for controlling the modulator, the feedback network also coupled to a reference signal (Vref) which the amplifier apparatus tracks, the feedback network further coupled to a current sense signal (Isen) proportional to the linear amplifier output current, and coupled to a switching amplifier signal (Vint) internal to the switching amplifier, the switching amplifier signal not derived from the output voltage and not generated by sensing the switching amplifier output current.
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