| 摘要 |
Power amplifier apparatus comprising a power amplifier ( 1 ) having a signal output, and a power control feedback loop ( 3, 4, 5 ) for controlling the output signal power relative to a first power target signal ( 8 ). A saturation control loop ( 6, 7 ) is responsive to a parameter indicative of saturation of the power amplifier ( 1 ) for adjusting the output signal power to a level at which the power amplifier means is substantially not saturated. A power target variation module ( 11, 15, 16 ) operable when the first power target signal ( 8 ) is at or close to a value corresponding to saturation of the power amplifier means ( 1 ) applies to the power control loop ( 3 to 7 ) a modified power target signal ( 17 ) corresponding to a power target higher than the first power target signal ( 8 ) and at which the power amplifier means ( 1 ) saturates. The modified power target signal ( 17 ) causes the saturation control loop ( 6, 7 ) to react to saturation of the power amplifier means ( 1 ) adjusting the output signal power to a level at which the power amplifier means ( 1 ) operates substantially at its maximum power but not saturated.
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