Part-I of this lecture will cover the latest trends in cellular RF communications such as upcoming bands,
carrier aggregation, envelope tracking, Antenna tuning & the chip sets which enable these technologies.
Part-II of this lecture will give an introduction to receiver chain design with emphasis on base-band filter block. Wireless signal reception is often accompanied by large blockers either coming from the self- transmitters in FDD technologies or from the nearby user equipment. This necessitate s the need for filters in RF domain to relax the linearity of the front end and in baseband domain to keep the ADC dynamic range within acceptable limits. Baseband filters not only have to bear the burden of filtering but also needs to have frequency tunability, programmable gain range, low noise, high linearity, excellent IQ matching and of course lower power & area for cellular handsets. These constraints make the task of filter design quite challenging especially in deep submicron CMOS technologies. This talk presents an overview of the filter design process for wireless receivers and describes the common techniques used for filter architecture selection, amplifier design and cares to be taken for laying out the filter.
Apu Sivadas completed his Ph. D. from IIT Kanpur in RF/Microwave Engineering in 1998. He was with
COMDEV space, Cambridge, Ontario designing Microwave components (1998-2001) and with Semtech
Corporation, Burlington (2001-2003) designing 12.5Gb/s Serdes IC for FR4 backplanes. In 2003 he
relocated back to India and joined Texas Instruments, Wireless Connectivity group. He managed the TI
RFIC design center for Connectivity products covering multiple radios including Wireless-LAN abg/n
along with CMOS PA Integration, Bluetooth, GPS, NFC and FM and multi-radio co-existence. From 2013
onwards, he is heading the RFIC Product design group in Qualcomm India where his group designs
advanced 4G LTE-A multi-mode RF transceivers for world-wide cellular market. He holds 13 issued US
patents and 5 IEEE papers.
Yogesh Darwhekar is Senior Staff Design Engineer in Qualcomm, Bangalore where he is currently involved in designing next generation cellular radio transceivers. Prior to joining Qualcomm he has been with the Wireless-RF design center of Texas Instruments where he has lead the RF team for Near field communication (NFC) radio. In the past, he has worked on several wireless connectivity technologies including GPS, Wireless-LNA and Bluetooth. His design interests include high performance receive filters, low noise fractional N-synthesizers and ultra-low power demodulators. He holds 6 granted patents and has published his work in ISSCC and ISCAS. He has a total industry experience of 15 years in analog-RF design and holds an MS degree from Indian Institute of Technology, Madras.