Keysight pushes to 110GHz for terabit high speed serial and optical designs

September 18, 2018 // By Nick Flaherty
Keysight has developed a new data acquisition chipset in Indium Phosphide (InP) for an oscilloscope that can handle up to 110GHz of analogue bandwidth and terabits of data per second.

The Infiniium UXR family of scopes is aimed at the latest high-speed serial such as DDR, USB and PCIe and optical designs as well as PAM4, 5G, radar and satellite communications.

“When we started this programme and looked at what the customer needs would be in the future we made a conscious decision to develop an entirely new technology set rather than adapt existing technology, that always has tradeoffs,” said Dave Cipriani, Vice President for the Digital and Photonics Centre of Excellence at Keysight.

 “It’s a completely new chipset on the next generation of the process, HB2D. This fourth generation 300GHz InP enables direct capture of the 110GHz without interleaving and we developed several chips in the front end module: a signal conditioning amplifier, the pre-amp in the HB2D InP process that goes into a 256Ga/S sampler and then into a SiGe process with lower samplers that we can get commercially.”

The 10bit differential A/D converter operates at 64Gsample/s and is interleaved across four chips so provide the total sampling of 256Ga/S, and in the high end 110GHz system there is one acquisition card per channel.

“This means we are sampling 10Tbit/s – we take 34 measurements in the time it takes light to travel 1cm,” he said. “To process all of this data we invented a new processor in 28nnm CMOS – do some of the correction ion phase and magnitude and interleaving correction using proprietary filters. We’ve also added hardware acceleration in key areas so we have 100K waveform/s in the plotter, up from 3K in software. Another area is the display and measurements for real time eye measurements – 1m /s – this is a big benefit to debugging serial buses.”

The chassis handles four channels, but units can be combined in a master-slave architecture for wider data capture. “We put four channels in the box as any coherent applications with an IQ pair need tight correlation,”

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