| 摘要 |
The invention relates to the gain control of radio amplifiers. In an amplifier circuit according to the invention, the employed output level is a differential pair provided with a tanh-1 predistorter as a control device. The predistortion is adjusted so that the differential pair operates all the time in the linear region, when the bias current IE and the transconductance of the pair are changed. By using the amplifier circuit according to the invention, there is achieved linear operation within a wide range of output power.
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