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Max The Magnificent
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re: RADX, Xilinx and ADI demo advanced, programmable EdgeQAM solutions
Max The Magnificent   10/17/2012 5:48:09 PM
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I was talking to the folks from RADX Technologies, Xilinx, and Analog Devices about all of this a few days ago. Now, just about everything about this technology is incredible ... but having said that, one thing that REALLY caught my eye was the AD9129 Digital-to-Analog (DAC) from Analog Devices. I mean, come on ... with 5.6 GSPS (gigasamples per second) and its 1.4 GHz of bandwidth, this enables the full cable spectrum to be synthesized in a single RF port. This dual-port device consumes 1.1W, which is 1/3 the power of competitive devices (I could tell you how they do this, but then they would send someone round to kill me). It also consumes only ~1/2 the pins of competitive devices (I think we're talking ~50 pins compared to ~100). As I say, this is a dual-port device. Now, when you think that a typical EdgeQAM system might require 80 to 100 ports, this means that you can be saving hundreds of watts of power and thousands of traces on the board. I am not an analog man, but I have to say that even I am impressed!!!



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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