70 GHz real-time oscilloscope from Tek claims lowest noise, highest ENOB
Other prospective purchasers of the unit will include those for whom the ability to capture the widest possible segment of bandwidth in one shot is a necessity. One of the first things you notice about the DPO70000SX is its compact format; in a reversal of recent trends to larger scope screens, this unit has only a small – if detailed – LCD screen. With this format, Tek recognises that most users will view the measurements on an attached monitor; and that at multi-GHz frequencies, short connections to the unit under test are essential and the benefits of the “compact” format will dominate.
Tek cites key features of the scopes as including;
– first 70 GHz real-time oscilloscope with Tektronix’ Asynchronous Time Interleaving (ATI) technology that preserves signal-to-noise ratio for higher fidelity. This means, the company says, that users can more accurately capture and measure their signals at higher speeds than possible with any other oscilloscope available today.
– 200 Gsample/sec sample rate with 5 psec/sample resolution for improved resolution and timing.
– compact form factor that enables the instrument to be positioned very close to the device under test (DUT) while providing flexible display and control for analysis. Reducing the distance to the DUT enables shorter cable lengths which in turn help to preserve signal fidelity at very high frequencies.
– scalable oscilloscope system with Tektronix’ UltraSync architecture that provides precise data synchronisation and convenient operation of multi-unit systems. Precise multi-channel timing synchronisation is key to meeting acquisition requirements in applications such as 100G and faster coherent optical modulation analysis.
As speeds go up and amplitudes go down, system noise becomes a major problem because it obscures important signal details. Through the use of ATI technology, DPO70000SX oscilloscope enables engineers to see more of their signal details with less noise and distortion so they can make better measurements and understand their system operation better.
Tek’s ATI approach to high-bandwidth digitising sends the incoming signal down two identical sampling channels, where they are digitised separately. Sample interleaving is in the time, rather than frequency domain; the full signal is digitised at a lower rate in both paths but the information to represent the full bandwidth of the incoming signal is still present. In an allusion to alternative approaches that split the incoming signal into two (or more) bands, then down-convert the higher band before digitising them separately, Tek asserts that there are issues of phase, amplitude, and other mismatches which are very difficult to overcome when the two bands are reassembled.
In particular, Tektronix says that the noise introduced by its sampling method reduces to the equivalent of a single channel, whereas in other approaches the noise-per-sampling-band is additive. High-speed signal processing takes place in devices built in a high-performance silicon-germanium process; Tek says it evaluated indium-phosphide technology but for this purpose the SiGe was superior, in part due to its better thermal performance.
Precise multi-instrument timing synchronisation is required for high-speed coherent optical applications. UltraSync meets this requirement with a high-performance synchronisation and control bus that allows multiple DPO70000SX oscilloscopes to work together to deliver the precise high-speed multi-channel acquisitions needed for these applications. UltraSync includes a 12.5 GHz sample clock reference and coordinated trigger bus for inherent acquisition-to-acquisition jitter equivalent to typical channel-to-channel jitter within a single instrument. It includes a high-speed data path to transfer waveforms from extension units to the master unit for analysis. Since each oscilloscope fully processes its acquired signals, only completed waveforms are sent to the master unit, maintaining performance even as more channels are added. UltraSync allows optical test software to manage a multi-instrument acquisition system for the most precise optical modulation analysis available. One of the uses for the smaller display screen is that in a multi-instrument configuration, it shows the master/slave status of the units.
DPO70000SX oscilloscopes come in a 5.25-in. tall form factor while retaining full high-performance functionality. This compact packaging means that engineers can stack two oscilloscopes in the same space as a standard bench oscilloscope.
The DPO70000SX also provides the flexibility to use one channel at 70 GHz, 200 Gsample/sec or two channels at 33 GHz, 100 Gsample/sec. Available dual unit systems synchronise two DPO70000SX units providing two channels at 70 GHz, 200 Gsample/sec each, or four channels at 33 GHz, 100 Gsample/sec operating as a single, coordinated instrument. Dual-unit systems can be separated into individual units when needed and a DPO7AFP auxiliary front panel gives direct control of common instrument settings to provide a typical bench oscilloscope experience – for a single unit or a multi-unit system.
DPO70000SX oscilloscopes are available worldwide with export restrictions for certain countries.
70 GHz ATI units start at €250,000 with a two-unit system starting at €381,000. A 33 GHz non-ATI unit is available starting at €226,000 with a two-unit system starting at €295,000.
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