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This paper presents a 28 GHz class-F1 power amplifier in 0.13-μm SiGe BiCMOS technology. The PA adopts a coupled-inductor based harmonic impedance modulator in order to terminate 2nd and 3rd harmonic load impedances appropriately for class-F1 operation. The coupled coils essentially provide frequency-dependent inductance that is optimal to resonate out 2nd and 3rd harmonic reactive impedance. The...
Power back-off performances of the modified power-combining Class-E amplifier under different amplitude-modulation schemes such as envelope elimination and restoration (EER) and envelope tracking (ET) are experimentally assessed in this paper. The modified output load network adopting three-harmonic terminations technique eliminates the need for additional lossy filtering section in the transmitter...
Analysis and synthesis of the new Class-E3F2 power amplifier (PA) are presented in this paper. The proposed circuit offers means to alleviate some of the major issues faced by existing Class-EF and Class-EF2 PAs, such as (1) substantial power losses due to parasitic resistance of the large inductor in the Class-EF load network, (2) unpredictable behaviour of practical lumped inductors and capacitors...
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