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A new type of source matching for improving the efficiency of an inverse Class-F (Class-F) amplifier is presented. The squared waveform voltage is generated by adjusting the phase of finite second harmonic voltage shift. To verify the superior performance of the proposed technique, two-stage HBT PAs with different types of source matching were fabricated using a commercial process. The proposed...
A class E power amplifier (PA) for a CDMA EER transmitter is implemented with GaAs HBT technology. This paper demonstrates an efficiency improvement with a parasitic capacitance compensation circuit. In order to obtain high output power, the PA needs the large emitter size of a main transistor. The larger the emitter size, the higher the parasitic capacitance should be. In particular, the parasitic...
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