Analysis and experimental waveform study on inverse class class-F mode of microwave power FETs

The new inverse class F operation mode for high-efficiency power amplifiers is analyzed. Unlike regular class F, it requires an open circuit termination at the second harmonic and a small impedance termination at the third harmonic. The inverse class F features higher PAE than class F but requires t...

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Bibliographic Details
Published in:2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017) 2000, Vol.1, p.525-528 vol.1
Main Authors: Wei, C.J., DiCarlo, P., Tkachenko, Y.A., McMorrow, R., Bartle, D.
Format: Article
Language:English
Subjects:
Capacitance
Diodes
Impedance
Microwave FETs
Microwave Theory and Techniques Society
Power system harmonics
Radio frequency
Voltage
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Summary:The new inverse class F operation mode for high-efficiency power amplifiers is analyzed. Unlike regular class F, it requires an open circuit termination at the second harmonic and a small impedance termination at the third harmonic. The inverse class F features higher PAE than class F but requires transistors with higher breakdown voltages. A study performed using the waveform measurement technique in conjunction with the active/passive load-pull system showed PAE=83% for the inverse class F compared to PAE=64% for the class F. The measured results are in good agreement with the analytical prediction.
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2000.861106