Title :
High-power time-domain measurement system with active harmonic load-pull for high-efficiency base-station amplifier design
Author :
Benedikt, Johannes ; Gaddi, Roberto ; Tasker, Paul J. ; Goss, Martin
Author_Institution :
Sch. of Eng., Cardiff Univ., UK
fDate :
12/1/2000 12:00:00 AM
Abstract :
A measurement system combining vector corrected waveform measurements with active harmonic load-pull extends, for the first time, real-time experimental waveform engineering up to the 30-W power level. The vector correction procedure is presented in this paper. A novel harmonic load-pull approach based on the real-time measurement capability of the system is demonstrated on a 4-W LDMOS device. A 20% increase in maximum output power to 4.7 W without degrading gain and efficiency is realized. Waveform analysis at various drive and load conditions directly identifies nonlinear capacitance effects being a key design issue for the design of highly efficient power amplifier
Keywords :
calibration; harmonic analysis; microwave measurement; microwave power amplifiers; mobile radio; power MOSFET; waveform analysis; 30 W; 30-W power level; 4 W; 4-W LDMOS; 4.7 W; active harmonic load-pull; base-station amplifier design; efficiency; gain; harmonic load-pull; high-power time-domain measurement; linear capacitance effects; mobile communication; power amplifier; real-time measurement; vector correction; waveform analysis; waveform measurement; Capacitance; Degradation; Power amplifiers; Power engineering and energy; Power generation; Power measurement; Power system harmonics; Real time systems; Time domain analysis; Time measurement;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
