A Holistic Experimental Static Bias Point Identification Method for Low Power Wireless RF Amplifier

Abstract

A holistic and effective experimental method of optimum static gate bias identification is presented here for a modern wireless Radio Frequency (RF) power amplifier operating in 1900 MHz band. The amplifier is targeted for low complexity, high efficiency and low power Base Station (BS) having RF conducted power of less than 1 watt at its output load. Through the measured results, it is shown that out of various other static gate bias points obtained, the optimum gate bias condition is achieved at 2.4 volts. At this bias point setting, the PA delivers a modulated output power of +24 dBm in a standalone mode and with external RF linearization circuits added, the channel power enhanced upto +26 dBm and the Adjacent Channel Power Ratio (ACPR) is improved by 5.3 dB. At linear back-off power level, the achieved efficiency is 13.2%.

Keywords:

• ACPR
• Linearization
• Power amplifier
• WCDMA

Additional information

Notes on contributors

Saroj K. Patro

Saroj K Patro is an experienced telecom professional working in the RF and wireless domain. He is a research scholar associated with NIST, Berhampur, Orissa (India). He holds BE in electronics and telecomm engineering from Sambalpur University. He has got more than 17 years of experience in RF & Microwave Products and antenna systems for wireless infrastructure equipment (mobile and fixed wireless), consumer electronics, CATV and satellite applications. His wide experience includes design, development, testing, system integration and field deployment of RF and antenna systems. He has published more than 15 papers in various national/international conferences of repute and journals. He is a Senior Member of IEEE (MTT Society). Corresponding Author. Email: [email protected]

Rabindra K. Mishra

Rabindra K Mishra (MSc, PhD) is a professor of Electronic Science Department of the Berhampur University, Orissa (India) since 2007. He has researched extensively in the areas of planar antennas and applications of soft-computing techniques for analysis and design of planar antennas. He visited the University of Birmingham as a British Commonwealth Fellow during 1999–2000. He has supervised 14 doctoral theses, published two mono-graphs and over 150 learned articles in journals of repute and proceedings of conferences, seminars, and so on, which earned him IETE Sir J. C. Bose best application paper award (1999) and Shri Hari Ohm Ashram Prerit Hariballabha Das Chunilal Research Endowment Award (2000), Samanta Chandra Sekhar Award in Engineering and Technology (2008), which is the highest award by the Govt. of Orissa. He is also recepient of INSA best teachers’ award 2015. Email: [email protected]

Ajit K. Panda

Ajit K Panda is a professor in National Institute of Science and Technology. He received his PhD in microelectronics from Sambalpur University, MTech in electronics and communication engineering and was a CSIR Fellow during his PhD. He received the BOYSCAST Fellowship from the Department of Science and Technology, Govt. of India to pursue his post doctorate at University of Michigan, USA. He is the recipient of ICTP Regular Associate Award for the collaboration work with ICTP Microelectronics Laboratory. He is an IEEE Distinguished Lecturer of Electron Device Society, senior member of IEEE, fellow of IETE, Life member of ISTE and member of VLSI Society of India. His research interests include VLSI design and MMIC. He has published 55 journal papers having Thomson Reuter Index Factor, presented papers in more than 100 international/national conferences and guided 10 students for PhD. He has carried out several successful projects based on UGC, DST, AICTE. MHRD, IUSSTF, UKIERI grant etc. Email: [email protected]