Method of ramping up output level of power amplifier of radiocommunication system

摘要

For a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and reception under a predetermined time management, a control method is provided which can lower and ramp up the output level of a power amplifier (200) within a predetermined time when a transmission mode is switched. When transmission in a first mode is switched to transmission in a second mode or when transmission in the second mode is switched to transmission in the first mode, the output level of the power amplifier is lowered once to a predetermined level higher than the level when transmission related circuits are activated, and thereafter the output level of the power amplifier is again ramped after the settings have been changed but with continuous operation of a transmission oscillator, TxVCO the phase control loop and the amplitude control loop.