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Abstract
To meet the ever increasing demands from the consumer end, modern mobile communication systems resort to complex modulation schemes like OFDM and QPSK. These modulation schemes have increased the Peak to Average Power Ratio (PAPR) of the RF signals to 12 dB and beyond. The transmitter block of the mobile communication system needs to have a linear RF power amplifier to track these signals effectively. Power amplifier block contributes to nearly 50% of the total power dissipation that occurs in a mobile transmitter. The linear RF power amplifier block is operated in back-off to avoid signal distortion, which basically happens at the cost of efficiency reduction. Envelope Tracking (ET) has emerged as a promising technique to improve the efficiency of linear RF power amplifiers working in back-off region. This paper provides an insight into the various efficiency enhancement techniques for RF power amplifiers working in back-off. Various power supply modulator architectures for ET Power Amplifiers are reviewed in detail. A brief overview of the control strategies implemented in a hybrid supply modulator is also presented. The paper also provides the designers with an insightful synopsis of the state-of-the-art work done in hybrid supply modulators.
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No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Ambily Babu
Ambily Babu has done her BTech in electronics & communication engineering from Mahatma Gandhi University, Kerala, India, in 2003 and MTech from VTU, Karnataka, India, in 2008. She is pursuing her PhD in electronics & communication engineering, under VTU, Karnataka, India. Her research interest includes power electronics and envelope tracking power amplifiers. Currently, she is working as an assistant professor in the Department of Electronics and Communication Engineering, AMC Engineering College, Bengaluru, affiliated to Visvesvaraya Technological University, Belagavi.
B.G. Shivaleelavathi
B G Shivaleelavathi has done her BE in electrical engineering from Bangalore University, Karnataka, India, in 1987. She did her ME from Mumbai University, in 1997 and obtained her PhD from Bangalore University, in 2012. She is currently working as a professor in the Department of Electronics and Communication Engineering, JSS Academy of Technical Education Bengaluru, Karnataka, India, affiliated to Visvesvaraya Technological University, Belagavi. She has published several papers in International conferences and Journals. Her field of interests are power electronics, IoTs and renewable energy sources. Currently, five research scholars are being guided by her and she has supervised one PhD KSCST has funded five of her students’ projects. KSTePS and VGST, Govt. of Karnataka has funded one Rs. 2 lakhs FDP as well. E-mail: [email protected]
Veeramma Yatnalli
Veeramma Yatnalli is an associate professor in ECE Department, JSS Academy of Technical Education, Bengaluru. She has done her ME in the year 1998, from BVB College of Engineering, Hubli, Karnataka University Dharwad and PhD from VTU in the year 2018. She is currently working as an associate professor in the Department of Electronics and Communication Engineering, JSS Academy of Technical Education Bengaluru, Karnataka, India affiliated to Visvesvaraya Technological University, Belagavi. Her area of research interests include digital signal processing, communication and image processing. Several papers in international conferences and journals, mainly in image compression and reconstruction domain, add to her credit. E-mail: [email protected]