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Class-D power amplifier with RF pulse-width modulation

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1 Author(s)
Raab, F.H. ; Green Mountain Radio Res. Co., Colchester, VT, USA

Single-ended (monopolar) and push-pull (bipolar) power amplifiers (PAs) are based upon complementary class-D PAs. The radio-frequency pulse-width modulation (RFPWM) waveform is produced in software and downloaded to a programmable-waveform generator. The PAs operate at 500 kHz and produce peak outputs of 100 W (monopolar) and 187 W (bipolar) with 85-percent efficiency. These amplifiers exhibit excellent linearity; IM products for single-tone AM and two-tone signals are about 40 dB below the desired sidebands. High efficiency is maintained over a dynamic range of 13 to 15 dB. This results in average efficiencies of 84 percent for signals with peak-to-average ratios up to 6 dB and 80 percent for a peak-to-average ratio of 10 dB. RFPWM also produces a clean output spectrum in which the spurious products are well removed from the desired signal.

Published in:

Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International

Date of Conference:

23-28 May 2010