NDLI: Bandwidth limits in PWM switching amplifiers

Content Provider	IEEE Xplore Digital Library
Author	Marco, L. Poveda, A. Alarcon, E. Maksimovic, D.
Copyright Year	2006
Description	Author affiliation: Dept. of Electron. Eng., Tech. Univ. of Catalunya, Barcelona (Marco, L.; Poveda, A.; Alarcon, E.)
Abstract	PWM buck switching power converters are good candidates for high efficiency power amplification of arbitrary band-limited signals. The correlation between the signal bandwidth and the switching frequency, in turn related to switching losses, imposes practical limits for high bandwidth applications. Stringent specifications appear in such applications as audio amplifiers (kHz signal bandwidths), and lately, in fast envelope tracking power amplifiers (MHz signal bandwidths) for the Envelope Elimination and Restoration technique in polar RF power amplification. Bandwidth limitations in PWM amplifiers are explored in this work by proposing design criteria for obtaining the switching frequency to signal bandwidth ratio $(f_{s}/f_{x})$ so as to guarantee a given aliasing error. To achieve that purpose, PWM spectra are reviewed for single tone, two-tone and multitone signals. Subsequently, by taking into account the analogy between PWM and FM spectra, bandwidths around the switching frequency are estimated by extending Carson's rule to an arbitrary error. This allows obtaining an extension of the Nyquist criterion for pulse-width modulation. System-level simulation results are reported to validate the analysis, showing that the conventional $f_{s}/f_{x}$ factor used in the power converter design field might be too conservative
Sponsorship	The Inst. of Electr. and Electron. Eng., Inc. Circuits and Syst. Soc. (IEEE CASS)
Starting Page	4
Ending Page	5326
File Size	4518357
Page Count	5323
File Format	PDF
ISBN	0780393899
DOI	10.1109/ISCAS.2006.1693835
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-05-21
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation Bandwidth Switching frequency Radiofrequency amplifiers Power amplifiers RF signals Pulse width modulation converters Switching converters Switching loss Signal restoration
Content Type	Text
Resource Type	Article

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