Solid State Circuits Society

January 20, 2005

Our speaker is  Dr. Osama Shana’a (Maxim Integrated Products), and the topic of his presentation is:
” Design Considerations for Low-Power High-Sensitivity Integrated WCDMA Direct-Conversion RF Receivers.”

Abstract:
The market for wireless communications has seen a drastic change in the past few years. The era where performance comes at the expense of cost is almost over. Wireless product manufacturers are demanding high-performance RF ICs at continuously declining prices. This means higher integration, higher sensitivity, lower die area and most importantly lower power. In fact, most cell phone makers are now demanding superhetrodyne-like sensitivity and current consumption of any proposed RF solution, even if it saves them significantly on the bill-of material. This talk will focus on design considerations to build high-performance direct conversion receivers with power consumption competitive to that of a superhet. Related design and architectural challenges will be addressed. An over view of direct-conversion receiver IC architecture for 3G WCDMA FDD radio will be presented along with some key RF system issues and integrated circuit implementation challenges. These issues include, DC-offsets, LO and interferer leakage, LO phase noise, I/Q channel mismatch, baseband channel filtering, and 2nd order distortion products. The techniques will be demonstrated on a fully integrated WCDMA direct conversion receiver that achieves a 3dB NF with 30mA total current consumption.

Osama Shana’a:
(S’95, M’00, SM’02) received his B.Sc. degree in electrical engineering with high honor from University of Jordan, Amman, Jordan, in 1992. In 1994 he was awarded the Fulbright Scholarship to pursue an M.S.EE degree from Portland State University, which he received in 1996. He received his Ph.D. degree in electrical engineering from Stanford University in 2000. In the summer of 1995, he joined Radio Comm. Corp., Portland OR, where he worked on the design of a fully integrated RF transceiver for the ISM band applications. In the summer of 1997, he joined National Semiconductor, Santa Clara CA, where he led a team to work on mixed signal megacell shareability. Since June 1998 he is with Maxim Integrated Products, Sunnyvale CA, where he led many successful RF wireless designs for PCS, CDMA, WCDMA, WLAN chipsets as well as circuits for TV tuner applications. Dr. Shana’a is a peer reviewer for many IEEE journals. He is also member of the Eta Kappa Nu honor society, and is a senior IEEE member.

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