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Kitchen, J.N.; Deligoz, I.; Kiaei, S.; Bakkaloglu, B.
IEEE transactions on microwave theory and techniques, 05/2007, Letnik: 55, Številka: 5Journal Article
Two integrated polar supply-modulated class E and F power amplifiers (PAs) in 0.18-mum SiGe BiCMOS process are presented. The amplifiers are used to transmit GSM-EDGE signals with an envelope dynamic range of 11 dB and a frequency range of 880-915 MHz. The amplifiers use switch-mode dc-dc buck converters for supply modulation, where sigma-delta (SigmaDeltaM), delta (DeltaM), and pulsewidth modulation are used to modulate the PA amplitude signal. A framework has been developed for comparing the three switching techniques for EDGE implementation. The measurement results show that DeltaM gives the highest efficiency and lowest adjacent channel power, providing class E and F PA efficiencies of 33% and 31%, respectively, at maximum EDGE output power. The corresponding class E and F linearized amplifiers' output spectra at 400-kHz offset are -54 and -57dBc, respectively
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