Solid State Circuits Society

Mar 18, 2004

Our speaker was  Dr. Pengfei Zhang (RF Micro-Devices), and the topic of his presentation was
“A Direct Conversion CMOS Transceiver for IEEE 802.11a Wireless LANs“

With WLAN explosion the RFIC’s have become a very important solid-state design activity. This presentation describes a CMOS transceiver fully compliant with IEEE 802.11a standard in the Unlicensed National Information Infrastructure (U-NII) band at 5.15-5.35 GHz.

It uses direct conversion architecture in order to reduce the chip area and power consumption. The transceiver contains the receiver with AGC, the transmitter with programmable output power and reconstruction filters and the frequency synthesizer. It achieves a sensitivity of -69 dBm and an error vector magnitude of -29.3 dB for 64QAM OFDM signals at 54Mbit/s data rate. Frequency synthesizer uses single-sideband mixing technique for LO generation to avoid frequency pulling.

Realized in 0.18-um CMOS and operating from 1.8 V single supply, the chip consumes 171 mW in receive mode and 135 mW in transmit mode.

Pengfei Zhang (M’97) received the B.S., M.S. and Ph.D. degrees in Electrical Engineering from Tsinghua University, Beijing, China, in 1988, 1990 and 1994, respectively. From 1994 to 1996, he was a Post-Doctoral Scientist of the Electrical Engineering Department at University of California, Los Angeles, CA, where he did research on numerical simulation of SOI devices. From 1996 to 1999, he was with Rockwell Semiconductors, Inc, Newport Beach, CA, where he worked on advanced process technology development for 56K-Modem. From 1999 to 2000, he was with Fujitsu Microelectronics, Inc., San Jose, CA. He worked on design methodology for signal integrity in mixed-signal IC’s and RFIC design for wireless networking applications. Since 2000, he has been with RF Micro Devices, San Jose, CA (formerly Resonext Communications, Inc), where he is Design Manager of RFIC group at the WLAN Division, working on transceiver chip development for multi-standard applications. His research interests are in the area of integrated circuits for wireless communications.

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