Design of H-Bridge Class-D Power Amplifiers for Digital Pulse Modulation Transmitters
This paper presents an H-bridge class-D power amplifier (PA) for digital pulse modulation transmitters. The class-D amplifier can be driven by two-or three-level digital signals generated by a delta-sigma modulator (DSM) and provides a linear microwave output after filtering. Within the amplifier, t...
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Veröffentlicht in: | IEEE transactions on microwave theory and techniques 2007-12, Vol.55 (12), p.2845-2855 |
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Sprache: | eng |
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Zusammenfassung: | This paper presents an H-bridge class-D power amplifier (PA) for digital pulse modulation transmitters. The class-D amplifier can be driven by two-or three-level digital signals generated by a delta-sigma modulator (DSM) and provides a linear microwave output after filtering. Within the amplifier, the pull-up and pull-down devices are driven separately to improve the amplifier efficiency by minimizing the loss associated with shoot-through current. The H-bridge class-D PA system was tested with code-division multiple-access IS-95 signals at 800 MHz. Using binary DSM signals, a drain efficiency of 31% was achieved with an output power of 15 dBm and an adjacent channel power ratio of -43 dBc. With three-level DSM signals, a drain efficiency of 33% was achieved at same output power. An analysis of the factors governing amplifier efficiency is provided. |
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ISSN: | 0018-9480 1557-9670 |
DOI: | 10.1109/TMTT.2007.909881 |