NDLI: Characterizing fast-scale instability in a buck-based switching amplifier for wideband tracking

Content Provider	IEEE Xplore Digital Library
Author	Rodriguez, E. Guinjoan, F. Poveda, A. Alarcon, E. El-Aroudi, A.
Copyright Year	2008
Description	Author affiliation: Dept. of Electron. Eng. Tech., Univ. of Catalunya, Barcelona (Rodriguez, E.; Guinjoan, F.; Poveda, A.; Alarcon, E.)
Abstract	This paper provides a first exploration of fast-scale stability borders for switching power converters operating as wideband switching amplifiers. Such operation is required in audio amplifiers, envelope trackers in polar RF transmitters and line drivers for Power Line Communications. A buck converter with output voltage proportional feedback in a signal tracking configuration with a sinusoidal reference is considered (Figure 1). The work first characterizes the effect of the classical set of parameters used in regulation stability analysis (output resistance, reactive components, switching frequency, feedback gain), and considers the output voltage to cover the complete dynamic range and hence disappear as a variable in the parametric space. Complementarily, the effect of the ratio of the tracking or baseband frequency to the switching frequency is added as a new variable in the design space indicative of wideband tracking operation. Characterization tools encompass families of time domain simulations as dynamic bifurcation diagrams for the time-varying reference. The paper concludes by exploring the effect of momentarily losing fast-scale stability upon the output signal spectrum, since applications such as adaptive supply of RF power amplifier are subject to strict spectral masks.
Starting Page	3262
Ending Page	3265
File Size	181552
Page Count	4
File Format	PDF
ISBN	9781424416837
DOI	10.1109/ISCAS.2008.4542154
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Broadband amplifiers Radiofrequency amplifiers Communication switching Power amplifiers Stability Radio frequency Voltage Output feedback Switching frequency Switching converters
Content Type	Text
Resource Type	Article

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