| 摘要 |
A transmission apparatus has two modes of power amplifier operation, in which mode 1 is inherently accurate, mode 2 is inherently less accurate, and measurement of a power amplifier output from mode 1 is used to correct a power amplifier output in mode 2 . Mode 1 may be a compressed mode and mode 2 may be a non-compressed mode. The apparatus may include a power controller that provides overlapping scaling factor sets for modes 1 and 2 and controls transmission power using the scaling factor sets. Upon a mode transition, the controller uses the overlapping scaling factors and changes the scaling factor set for the mode of a destination of the transition based on actual measurement representative of transmission power, for example, by carrying out power alignment loop operations. A cellular mobile device may include such transmission apparatus. A polar modulation transmitter is also disclosed.
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