Title :
High Efficiency HBT Power Amplifier Utilizing Optimum Phase of Second Harmonic Source Impedance
Author :
Joon Hyung Kim ; Chul Soon Park
Author_Institution :
Seoul Design Center, Qorvo, Seongnam, South Korea
Abstract :
A new type of source matching for improving the efficiency of an inverse Class-F (Class-F -1) 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 PA delivers approximately 4.8% improvement in efficiency over a conventional PA. The peak output power is enhanced by 2 dB.
Keywords :
heterojunction bipolar transistors; power amplifiers; HBT power amplifier; finite second harmonic voltage shift; inverse Class-F amplifier; second harmonic source impedance; source matching; squared waveform voltage; Harmonic analysis; Heterojunction bipolar transistors; Impedance; Power generation; Power measurement; Power system harmonics; Wireless communication; HBT; PAE; power amplifier; second harmonic;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2015.2479837
