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dc.contributor.authorHe, Huiqiaoen_US
dc.contributor.authorKang, Yangen_US
dc.contributor.authorGe, Tongen_US
dc.contributor.authorGuo, Linfeien_US
dc.contributor.authorChang, Joseph Sylvesteren_US
dc.identifier.citationHe, H., Kang, Y., Ge, T., Guo, L., & Chang, J. S. (2019). A 2.5-W 40-MHz-bandwidth hybrid supply modulator with 91% peak efficiency, 3-V output swing, and 4-mV output ripple at 3.6-V supply. IEEE Transactions on Power Electronics, 34(1), 712-723. doi:10.1109/TPEL.2018.2827396en_US
dc.description.abstractWe describe a supply modulator comprising a proposed delay-based hysteresis controller, proposed wideband class-AB amplifier, and class-D amplifier for an envelope tracking (ET) power amplifier (PA). We investigate the power dissipation and optimization method of the supply modulator for wideband applications taking into consideration the propagation delay, and show that a controller with zero threshold current not only improves the bandwidth of the supply modulator but also reduces its power dissipation. Based on our investigations, we propose a delay-based hysteresis controller embodying a novel high-speed current comparator whose reference current (threshold current) is zero, thereby achieving higher power-efficiency and simpler hardware. We further propose a class-AB amplifier, which features a high bandwidth and accurately controlled quiescent current. The proposed supply modulator features simultaneously the wide bandwidth (40 MHz), high output power (2.5 W), high peak efficiency (91%), high output voltage swing (3 V), and low output ripple noise (4 mVrms) at 3.6-V supply. The ET PA embodying our proposed supply modulator achieves a high power-efficiency of 41.4% at 28.5-dBm peak output power and 34.4% at 3-dB backoff- A significant >1.6× improvement over the radio frequency PA without the supply modulator.en_US
dc.relation.ispartofIEEE Transactions on Power Electronicsen_US
dc.rights© 2018 IEEE. All rights reserved.en_US
dc.subjectEngineering::Electrical and electronic engineeringen_US
dc.titleA 2.5-W 40-MHz-bandwidth hybrid supply modulator with 91% peak efficiency, 3-V output swing, and 4-mV output ripple at 3.6-V supplyen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.subject.keywordsCMOS Analog Integrated Circuitsen_US
dc.subject.keywordsCommunication System Power Suppliesen_US
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