1 instavu, dpo, 3 rd gen dpx. 2 agenda evolution art, instavu, dpo, 3 rd gen dpx 3 rd gen dpx...
TRANSCRIPT
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Agenda
Evolution ART, InstaVu, DPO, 3rd gen DPX
3rd gen DPX comparison to Xstream and MegaZoom
Lab: Demonstrate 3rd gen DPX throughput advantages for troubleshooting, measurements and tests vs. Xstream and MegaZoom.
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Evolution of Oscilloscopes
MarketDrivers
Customer Challenges
DSO1980 1998
ART
1950
• Military• Vacuum tube
technology• Emerging solid
state technology• Broadcast video
• Device characterization
• Signal edges and waveshapes
• Computers• LSI• Digital data• Mixed signal
environments• Faster
microprocessor clock rates
• System integration• Quality assurance
• Signal data• High-frequency
effects• Documentation
• Convergence• Interoperability• Faster data rates
and microprocessor clocks
• Complex signals• Standards compliance• Test equipment
performance
Scope Technology DPO
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Analog Oscilloscope
Benefits Direct visual impression of actual
signal behavior Intensity grading (frequency of
occurrence information) No quantizing error or aliasing Very fast waveform capture rate
Shortcomings Purely visual information Blink and miss Limited bandwidth
performance Edge triggering No pre-trigger information Optimized for single channel
operation Limited writing speed for low
repetition rate signals
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Transition from ART to DSO Waveform Capture RateIs Limited By Holdoff Time
DSO Cycle
ART CycleDisplayed Sweep
Sweep Holdoff Time
Typical Capture Rate Range
Maximum Capture Rate
1 - 100 Hz
7104 Analog scope 400k/sec
Acquire New Signal
System Holdoff Time
Process Signal Update Display
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1995 TDS784 InstaVu – The 1st Generation
Benefits First scope to achieve the
bandwidth and waveform capture rate of the world’s fastest analog scope the 7104
Shortcomings Max InstaVu sample rate 1GS/s E.T. Waveform image depth 1bit
No gray scale, only persistence Measurement rate 30/sec
Conventional measurement made on a single waveform
InstaVu records 500pts DSO records 0.5Mpts
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The Challenges
Dynamic-Complex Signals May contain multiple modulation types including frequency,
phase, amplitude, and/or noise Reside in new dense signal environments May contain:
Complex modulated RF Jitter Glitches Cross Talk Contention
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1998 The Second Generation
A new oscilloscope technologythat stores, displays, and analyzes
dynamic-complex signalsin real time.
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1998 A Breakthrough SolutionThe Digital Phosphor Oscilloscope
Digital Phosphor OscilloscopeAn instrument that digitizes electrical signals and displays, stores, and analyzes three dimensions of signal information in real time.
DPO Amp A/D Display
uP
DPXWaveform ImagingProcessor
ParallelProcessing
Acqui-sition
Rasterizer
DigitalPhosphor
DisplayMemory
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1998 Compare the Architectures
DSO
DPO
Amp DeMUXAcqui-sition
MemoryuP Display
MemoryA/D Display
Amp A/D Display
uP
DPXWaveform ImagingProcessor
SerialProcessing
ParallelProcessing
ARTAnalogDisplay
X
YZ
Horiz Sweep
VertAmp
DelayLine
Trigger
DisplayAmp
Acqui-sition
Rasterizer
DigitalPhosphor
DisplayMemory
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1998 Tektronix TDS784D DPO, Technology Enhanced by DPX™
DPX is a Tektronix proprietary waveform imaging processor that creates and manages the real-time intensity grading
Each channel has its own DPX Waveform Imaging Processor
DPX is a 13 mm2 die using 0.65µ CMOS Technology and 1.3 million transistors
DPX provides 24,000,000,000 read-modify-write operations (RMW) per second
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1998 TDS784D DPO – The 2nd Generation
Benefits 2GHz bandwidth with 400,000
acquisitions/second Waveform image depth 22 bits Gray scale in DPO DPO record length up to 0.5Meg Z axis modulation
Shortcomings Max DPO sample rate 1GS/s Measurement rate 30/sec
Conventional measurement made on a single waveform
Min/max compression 8Meg records required E.A.L mode
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DPO Is Not A Persistence Mode
DPOs provide intensity grading, in real-time, as part of the acquisition system Limited only by acquisition (trigger) rate Provides intensity graded display information on dynamic signals Captures dynamic signal variations, in real-time, enabling the user to see actual signal behavior Rapidly builds a statistical representation of actual signal behavior
Analog DSO Persistence DPO
Persistence modes can create intensity grading in the display system by using normally acquired waveforms and post processing Limited by the DSOs capture rate Lacks real time feedback May miss intermittent events Limited in actual distribution of events information
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The Challenges
Extend the ability to examine Dynamic complex signals to the data rates and time windows required for today’s computer and communications
Measurement and test throughput
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DPO ParallelProcessing
Amp A/D Display
Windows processor
Acqui-sition
Rasterizer
DigitalPhosphor
Display &MeasureMemory
DSP &Measure
Fast 64 bit Measurements with Statistics
“Measurement throughput to match waveform throughput”
Today: 3rd Generation DPX
Digital Phosphor OscilloscopeAn instrument that digitizes electrical signals and displays, stores, and analyzes three dimensions of signal information in real time.
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Today: TDS7000 3rd Generation DPX
Benefits 4GHz bandwidth with 400,000
acquisitions/second Waveform image depth 64 bits Gray scale record view
compression View entire record
Fast Acq record length up to 1Meg WfmDB sample rate 20GS/s ET
Real sample every 50ps after trigger
Fast waveform data base measurements
Amp A/D Display
Window’s processor
Acqui-sition
Rasterizer
DigitalPhosphor
Display &MeasureMemory
DSP &Measure
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Still the leader Waveform Capture Rate Including Infiniium MegaZoom and WaveMaster Xstream
Waveform Capture Rate(Waveforms/Second)
Sweep Speed (Log Scale)5 ms/div 500 ps/div0.1
1
10
100
1000
10000
100000
1000000
Infiniium 54855 6GHz140 Waveforms/Sec
MegaZoom
TDS7000 3rd gen DPX >400,000 waveforms/Sec
TDS3000B with DPOAcquisition >3500 Waveforms/Sec
LeCroy WaveMaster 8600 with APO+Segmented Mem1000 waveforms/Sec, best case
Xstream
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LeCroy says in the press:
“LeCroy claims that WaveMaster, in segmented memory mode, betters by
50% the 400,000 waveforms/sec of Tektronix’s fastest DPO displays”
Source: Smart Scopes, EDN magazine,Dan Straussberg, March7, 2002
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Today Tektronix 3rd Gen DPX
FastAq Mode
60 sec @ 1us/div
DPO is hundreds of times faster than Xstream for troubleshooting
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LeCroy fud in the press:
“2.5Gb/s eye diagram using LA Techniques LA19-01-01 producing PRBS data stream. LeCroy using SDM software
option in mask test mode.”
Throughput ratio: LeCroy/Tektronix=651
Source: Scopes trial, EDN magazine,Dan Straussberg, March 6, 2003
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Xstream Mask Testing – SDA6000
20GS/s dots
Mask testing
measurements
Clock recovery
Sequential acquisition
1400 UI/min
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3rd Gen DPX Mask Testing TDS7404
20GS/s dots
Mask testing with measurements
Clock recovery
Wfmdb acquisition
483,000 UI/minute
350X fasterthan SDA (4000X faster in fast acq at 1.25GS/s)
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Infiniium 54853, 54854 and 54855
Waveform throughput limited to about 100/sec Poor choice for troubleshooting or analyzing complex
waveforms Midrange Infiniiums are faster than WaveMaster
No support for serial data testing today. Agilent certainly knows how to do this on DCA.
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Summary: InstaVu, DPO, 3rd Gen DPX
Significant advances with each generation of fast acquisition.
Xstream or MegaZoom cannot match our waveform throughput for troubleshooting or analyzing complex waveforms.
3rd generation DPX’s combination of 20GS/s precision, fast throughput and 64 bit data base measurements exceed SDA or Infiniium by a wide margin.
Hands on labs with the competitor’s products to see for yourself.
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Knowledge Review
3rd gen DPX’s Waveform Data Base is acquired at 1GS/s, 1.5GS/s, 20GS/s?
Xstream is 100X, 1X, .003X faster than 3rd Gen DPX for troubleshooting?
SDA with Xstream is 100X, 1X, 0.003X faster for mask and compliance tests on fast serial data?
MegaZoom is more likely, about same, less likely to be able to identify and measure distribution of occurrence information?