| 摘要 |
A RFPA (radio frequency power amplifier) circuit ( 150 ) which includes a RFPA ( 101 ), a supply voltage source ( 104 ), means ( 155 ) for applying to the RFPA a gain control bias voltage and a feedback control loop ( 156 ) for adjusting a voltage applied to the RFPA, the feedback control loop including a sampler ( 107 ) for sampling an output of the RFPA, a RF detector ( 109 ) for detecting a level of RF power sampled by the sampler, a comparator ( 115 ) for comparing an output signal from the RF detector with a reference signal, an integrator ( 117 ) for integrating an output signal of the comparator and a voltage regulator ( 151 ) having a first input from the integrator and a second input from the supply voltage source and an output connected to the RFPA, the regulator being operable to apply to the RFPA a supply voltage adjusted in response to an input signal from the integrator.
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