| 摘要 |
A power amplifier has a feedback loop to control the signal level thereof. A current sensing amplifier in the feedback loop is controlled to remove any offset. The input signal is compared with a reference level. When the input signal is below the reference level, an offset compensation value for the current sensing amplifier is stored. When the input signal is above the reference level, the previously stored offset compensation value continues to be applied. The circuit is of particular application in a TDMA radio transmitter.
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