| 摘要 |
A radio transmitter apparatus performing an ALC operation by selecting either of a high power mode and a low power mode and capable of further increasing a level difference of transmission power levels in the modes while supplying a stable detection voltage to an ALC circuit without destruction of a detection diode, including a transmission power generating stage, a detection unit, an ALC circuit performing automatic level control, and an ATPC unit performing automatic power control for operation in either of the high power mode or the low power mode, the detection unit configured by a first detection unit which becomes effective in the low power mode and a second detection unit which becomes effective in the high power mode.
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