High Efficiency, High Switching Speed, AlGaAs/Gaas P-HEMT DC-DC Converter for Integrated Power Amplifier Modules
In wireless communication systems, the efficiency of the Radio Frequency Power Amplifiers (RF-PA) dominates the power consumption of the radio transceiver. In addition, to improve spectral efficiency of communication standards, non-constant envelope modulations with high peak to average signal variations are being adopted. This translates to strict requirements on the power amplifier linearity to avoid signal distortion. Such highly linear amplifiers are inefficient, particularly at "Backed-off" power conditions, where the power amplifier typically operates for most of its operating time. Polar modulation is an effective technique to alleviate the linearity-efficiency tradeoff.