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Pulse-Width Modulated Digital Transmitters

The demand for high data rate in modern communication systems has accelerated the shift towards complex modulation schemes. This in turn has dictated the need for highly-linear PAs that can meet the Error Vector Magnitude (EVM) requirements for modulation schemes with high peak-to-average power ratio (PAPR) such as 16-QAM, 64-QAM, OFDM, etc. A particular enabling technology for high efficiency PAs is switched-mode operation such as Class D/E/F, where the power transistor is driven into deep ohmic region and behaves as a switch that efficiently modulates the incoming RF signal. This project explores a novel architecture that enables both efficient and linear operation by applying a modulator to translate RF signals with varying envelope into pulses for multiple band operation.


Students Involved: W. Gaber, S. M. S. Rashid, S. Elabd, S. Balasubramanian, M. R. LaRue