| 摘要 |
A digital power amplifier with variable output power control is disclosed. An amplifying stage includes a first attenuator that applies one of n attenuation steps to an RF signal in response to a desired output power level of the digital power amplifier. A feedback loop provides a gain control signal to the amplifying stage based upon an output of the amplifying stage. The feedback loop includes a second attenuator that applies another of the n attenuation steps to a sample of the output of the amplifying stage. The second attenuator applies the k<SUP>th </SUP>highest of the n attenuation steps when the first attenuator applies the k<SUP>th </SUP>lowest of the n attenuation steps, where 1<=k<=n.
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