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  7. Fujitsu Develops Industry’s First CMOS Integrated Circuit that Recovers Clock and Data at 40-44Gbps

Fujitsu Develops Industry’s First CMOS Integrated Circuit that Recovers Clock and Data at 40-44Gbps

Low Power, High Integration Provided by CMOS to Enable 40Gbps Optical SerDes

Fujitsu Laboratories of America Inc.,Fujitsu Semiconductor America Inc.

San Francisco, CA, February 13, 2007

Fujitsu Microelectronics America, Inc. (FMA) today announced that Fujitsu Laboratories of America, Inc. and Fujitsu Laboratories Ltd. have developed the industry’s first CMOS IC that performs clock and data recovery (CDR) at 40 to 44Gbps, enabling the future implementation of 40Gbps optical serializer-deserializer modules.

Details on this technology were presented by Fujitsu Laboratories in a paper entitled “A 40-to-44Gb/s 3× Oversampling CMOS CDR/1:16 DEMUX” at the annual International Solid State Circuits Conference (ISSCC), February 13, in San Francisco.

The paper detailed the first CMOS IC that recovers clock and data at rates of 40 to 44Gbps, and de-multiplexes to 16 x 2.5Gbps. The IC also complies with the ITU G.8251 jitter tolerance mask standard, achieving BER <10-12 with a 231-1 PRBS source. Previous ICs with similar or less functionality have been implemented in SiGe, biCMOS and other compound semiconductor technologies. Those ICs typically dissipated three times as much power as the CMOS version. The low power consumption, along with higher integration and reduced manufacturing cost afforded by CMOS technology, meets the requirements for developing compact form-factor 40Gbps optical SerDes modules.

“This research demonstrates the viability of CMOS for implementing the most difficult circuit blocks in future high-speed optical modules,” said William Walker, vice president of the Components and Devices Integration Group at Fujitsu Laboratories of America, Inc. “In the near future, we will be able to demonstrate that the remaining blocks, such as the serializer and limiting amplifier, can also be implemented in CMOS and integrated together with the deserializer on the same IC.”

The CMOS CDR, which dissipates 0.91W while operating at 40Gbps, uses a novel 3× oversampling architecture. The die size is 0.8×1.8mm2 and was fabricated in Fujitsu’s 90nm CMOS process. Input data is sampled using a 24-phase distributed VCO, and a digital CDR recovers 16 bits and a 2.5GHz clock by processing the samples. The ISSCC paper was presented with support from Keio University in Japan, where Keio University students worked with Fujitsu’s team.

About Fujitsu Laboratories Ltd.

Founded in 1968 as a wholly owned subsidiary of Fujitsu Limited, Fujitsu Laboratories Ltd. is one of the premier research centers in the world. With a global network of laboratories in Japan, China, the United States and Europe, the organization conducts a wide range of basic and applied research in the areas of Multimedia, Personal Systems, Networks, Peripherals, Advanced Materials and Electronic Devices. For more information, please see:

About Fujitsu Laboratories of America, Inc.

Fujitsu Laboratories of America, Inc. is a wholly owned subsidiary of Fujitsu Laboratories Ltd. (Japan), focusing on research and development of Advanced VLSI CAD, Internet, and interconnect technologies. Conducting research in an open environment, it contributes to the global IT industry and research community. It is headquartered in Sunnyvale, CA. For more information, please see:

About Fujitsu Microelectronics America, Inc.

Fujitsu Microelectronics America, Inc. (FMA) leads the industry in innovation. FMA provides high-quality, reliable semiconductor products and services for the networking, communications, automotive, security and other markets throughout North and South America. For more information about 10 Gigabit Ethernet please see,or address e-mail to

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Date: February 13, 2007
City: San Francisco, CA
Company: Fujitsu Laboratories Ltd., Fujitsu Laboratories of America, Inc., Fujitsu Microelectronics America, Inc.