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CMOS IC performs CDR at 40-44Gbps CDR

Posted: 16 Mar 2007     Print Version  Bookmark and Share

Keywords:Serdes  CMOS  CDR  Fujitsu 

Fujitsu Microelectronics America Inc. has 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 40Gbps to 44Gbps, enabling the future implementation of 40Gbps optical Serdes modules.

Fujitsu Laboratories described the product as the first CMOS IC that recovers clock and data at rates of 40-44Gbps, 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, VP of the components and devices integration group at Fujitsu Laboratories of America. "In the near future, we will be able to demonstrate that the remaining blocks, such as the serialiser and limiting amplifier, can also be implemented in CMOS and integrated together with the deserialiser on the same IC."

The CMOS CDR, which dissipates 0.91W while operating at 40Gbps, uses a novel 3x oversampling architecture. The die size is 0.8-by-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 16bits and a 2.5GHz clock by processing the samples.




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