POWER AMPLIFICATION CIRCUIT AND METHOD FOR SUPPLYING POWER AT A PLURALITY OF DESIRED POWER OUTPUT LEVELS

摘要

The present invention provides a method and apparatus for supplying electric power to the load on a plurality of different power levels. The method includes changing at high and low output-to-output of the power amplifier when amplifying a signal having a common modulation format. In the high-power output and the bias applied to the power amplifier has a different bias is applied to the power amplifier at low power output. The output of the power amplifier is low, the output, the impedance in the high-power output is applied that is different from the impedance to be applied to the output portion of the output power amplifier. For at least one embodiment, the power amplifier according to whether a power amplifier is that the change in the low-power output from the high-power output, or the power amplifier is changed into a high power output at low power output, the variation between high power and low power outputs at different threshold levels . ; Bias adjustment, the output power level, the variable impedance