ADC suits 100G coherent receivers, testers.

Press Release Summary:

Combining CHArge-mode Interleaved Sampler (CHAIS) technology with 65 nm CMOS process, single-chip DP-DQPSK coherent receiver, designed for 100G optical networks, has 4-channels of 56 GS/sec 8-bit ADCs (I and Q signals, H and V polarization) integrated with logic and memory to perform complete receive PHY function when connected directly to optical front-end. Power consumption is rated at 2 W per channel (typ) at 56 GS/sec, and half-speed mode provides 28 GS/sec at 1 W per channel.

Original Press Release:

Fujitsu Launches Ultrafast 56GSa/s 8-Bit ADC Technology for 100G Coherent Receivers and High-Performance Test Equipment

Langen, Germany, January 27th 2009 - Fujitsu Microelectronics Europe (FME) announces the availability of its new ultrafast ADC IP based on the revolutionary CHArge-mode Interleaved Sampler technology (CHAIS) for use in its standard 65nm CMOS process technology. This new high-speed ADC technology provides breakthrough performance levels in a standard CMOS process, enabling the integration of multiple ADCs with tens of millions of gates of signal processing logic and memory on a single chip. Initially targeting use in coherent receivers for 100G optical transmission, the technology is also applicable to high-end test equipment and any other system requiring high-speed data conversion and processing.

The new CHAIS technology provides previously unachievable combinations of sampling rate, resolution and power consumption. These circuits avoid many of the limiting factors, such as restricted bandwidth and poor linearity, of conventional architectures to make ADCs with sampling rates of up to 100GSa/s feasible in CMOS for the first time.

Power consumption for the ADC is 2W typical per channel at 56GSa/s, which is unheard of for this performance level (ENOB>6) - a half-speed mode provides 28GSa/s at 1W per channel. A 1.75GHz input reference clock is internally multiplied to provide ADC sampling clocks with less than 100fs total rms jitter and less than 500fs I/Q ADC skew.

"With our new ADC technology in combination with the ability to integrate in excess of 50 million logic gates, we provide the enabling technology for upcoming telecom applications, such as 100G Ethernet and OTU-4", said Dirk Weinsziehr, Vice President of Marketing and Development at FME. "Based on this technology our customers can build bespoke products with lower power consumption, higher integration and a unique manufacturability to secure their leading position in the market."

The first production application of this breakthrough ADC technology will be a single-chip DP-DQPSK coherent receiver for 100G optical networks, with 4-channels of 56GSa/s 8-bit ADCs (I and Q signals, H and V polarisation) integrated with logic and memory to perform the complete receive PHY function when connected directly to the optical front-end.

A single-chip solution avoids the need to transfer terabits-per-second of data between ADC and DSP chips - reducing power consumption, silicon area and number of I/O pins. The need for expensive multi-chip module (MCM) technology is eliminated.

The increased ADC resolution and sampler dynamic range eases the design of the optical front-end by allowing part or all of the AGC function to be realised digitally after the ADC.

Continuous digital background self-calibration during operation means that external calibration test signals or non-volatile calibration memory are not required, and no user intervention is needed to achieve and maintain the specified performance levels.

"Current high-speed ADCs are mostly developed in a SiGe process technology. Products using such technology tend to suffer from high power consumption and limited integration with digital signal processing. We saw a strong demand from our customer base for high-performance data converters in standard CMOS technology," explained Neil Amos, Director of the Communications Business Unit at FME. "With this groundbreaking ADC technology, Fujitsu now provides the option to integrate analogue conversion at GSa/s and digital signal processing on the same die. Originally driven by telecom applications we now see increasing interest in test and measurement and high-speed interface applications."


The ADC will initially be available in 2009 in Fujitsu's CS200 65nm process technology as 2-channel and 4-channel 56GSa/s 8-bit macro cells. Other channel counts, sampling rates, resolutions and process nodes will follow according to market demands.

About Fujitsu Microelectronics Europe

Fujitsu Microelectronics Europe (FME) is a major supplier of semiconductor products. The company provides advanced systems solutions to the networking, mobile telephony, automotive, digital TV and industrial markets. Engineers from design centres dedicated to mixed-signal, communication, microcontrollers, graphics controllers, multimedia ICs, ASIC products and software development, work closely with FME's marketing and sales teams throughout Europe to help satisfy customers' system development requirements. This solutions approach is supported by a broad range of advanced semiconductor devices, IP, building blocks and software.

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