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Rohde & Schwarz R&S RTO Series oscilloscope

5/5/2011 02:13 PM EDT
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alan_#1
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re: Rohde & Schwarz R&S RTO Series oscilloscope
alan_#1   5/10/2011 12:38:18 PM
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DrDSP asked for more detail. I assume you mean how does a digital trigger differ from a conventional analog trigger? Most scopes split the input signal into two paths. One goes to the ADC and the other to a trigger circuit which contains one or more analogue comparators. Calibration techniques are then used to remove amplitude and time delay differences between the two paths. Calibration at low input frequencies is fairly easy so the trigger point marker on the screen is exactly in the right place, but it gets difficult at high frequencies. Unless the bandwidth responses of the two circuits are identical you can end up with the scope triggering on glitches that the ADC can not capture or alternatively see glitches on screen that can not be triggered on. Digital triggering avoids all these problems as the triggering is done on the actual digital data after the ADC, this avoids any mismatches. Digital trigger circuits are fairly simple to implement when ADC sampling rates are low (less than 500MSPS) as the comparators and other circuits can be implemented in gate arrays. As sampling rates increase however it becomes more difficult. Toggle rates of digital components in FPGAs and custom ASICs are too slow for ADC data rates of say 5GSPS. This requires the data to be demuxed into multiple data paths (eg 16 x 8 bit paths). This then requires 16 parallel digital trigger circuits - you now have 128 digital comparators and registers (and significant timing issues) rather than a single analog comparator.

Kinnar
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re: Rohde & Schwarz R&S RTO Series oscilloscope
Kinnar   5/7/2011 3:23:27 AM
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It seem that DSOs are still being compared with Analog Scopes, it is time that it really needs the technology come out not the comparison with the old one. With Digital Timescale and Quantization techniques it might be possible to capture and display more realistic picture of the waveforms.

DrFPGA
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re: Rohde & Schwarz R&S RTO Series oscilloscope
DrFPGA   5/6/2011 11:13:24 PM
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It would be nice if the feature was described in more detail. How is it different from the typical debugger?

alan_#1
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re: Rohde & Schwarz R&S RTO Series oscilloscope
alan_#1   5/6/2011 6:15:02 AM
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Rohde & Schwarz are not correct in saying that they have developed the industry's only digital trigger. Pico Technology have been using this technique on their oscilloscopes for the last 20 years. I suspect other companies have as well.

_hm
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re: Rohde & Schwarz R&S RTO Series oscilloscope
_hm   5/6/2011 4:31:36 AM
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They look very attractive for debugging and will save lots of time. They also look very advance. How much does base model cost?

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