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Fundamental Modulation Limits for Minimum Switching Frequency Inband-Error-Free High-Efficiency Power Amplifiers

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4 Author(s)
Garcia i Tormo, A. ; Dept. of Electron. Eng., Tech. Univ. of Catalunya (UPC), Barcelona, Spain ; Poveda, A. ; Alarcon, E. ; Guinjoan-Gispert, F.

This paper explores the modulation bandwidth limits for switching amplifiers, by analyzing the fundamental tracking capabilities of two-level switching signals. With this aim, this work synthesizes two-level switching signals by obtaining the distribution of switching events providing both minimum average switching frequency and inband-error-free encoding, targeting to minimize the amplifier switching losses when tracking a generic bandlimited signal. This analysis also provides a framework reference to characterize the deviation from such limit in modulations used in actual amplifiers.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:58 ,  Issue: 10 )