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| LeCroy WaveExpert and GigaProbes(tm) a complete TDR/TDT probing system |
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Outstanding TDR/TDT Capabilities when hand probing is required using the GigaProbes™ 30Ghz 100/50 ohm TDR probes.
The WaveExpert Time Domain Reflectometry (TDR) is an essential tool for signal integrity measurements of today's high-speed designs. Impedance discontinuities in PCB's connectors, etc. can reduce the bandwidth supported by the channel. These critical measurements can be easily made, either as voltage reflections or as impedance measurements, using the TDR feature on the WaveExpert Series. The available TDR module (ST-20) includes a step generator that produces a fast step (typical rise time of 20 ps) to quantify sub-millimeter discontinuities in PCB's, backplanes, interconnects, etc.
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| Use the LeCroy "FreeHand" Probe holder to hold the GigaProbes(tm) in place to free up your hands to operate the LeCroy WaveExpert TDR system |
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Outstanding TDR/TDT Capabilities when hand probing is required using the GigaProbes™ 30Ghz 100/50 ohm TDR probes.
The WaveExpert Time Domain Reflectometry (TDR) is an essential tool for signal integrity measurements of today's high-speed designs. Impedance discontinuities in PCB's connectors, etc. can reduce the bandwidth supported by the channel. These critical measurements can be easily made, either as voltage reflections or as impedance measurements, using the TDR feature on the WaveExpert Series. The available TDR module (ST-20) includes a step generator that produces a fast step (typical rise time of 20 ps) to quantify sub-millimeter discontinuities in PCB's, backplanes, interconnects, etc.
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| DEVICE TEST BOARD IMPEDANCE AND S-PARAMETERS ANALYSIS |
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| TDR test setup schematic. Probe the PCB test pads without test socket to base line the signal integrity performance (TDR & S-parameters). Put the socket back on and probe the pogo pins to measure the impact on impedance and S-parameter return-loss. |
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| Probe test socket footprint with WaveExpert in differential TDR mode connected to the Gigaprobes™. Attach two SMA cables to the SMA Tx or Rx output to the scope sampling modules. This configuration allows for making TDR/TDT and real-time SDD11/21 S-parameters to 20GHz |
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| Differential TDR plot without test socket. Click on image for full size view. |
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| Realtime SDD11 and SDD21 S-parameters from the Test socket pogo pins to I/O SMA connectors |
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This TDR/TDT and SDD11/21 real-time plot verify the transmission path from the pogo pins within the socket and the interconnect components before the board is populated with active devices. If the rise time of the interconnect path is not 5-7 faster than the signal rise time, it degrades the eye diagram. Notice excessive rise time slop indicating excessive interconnect signal loss through this test board. Use cursers to measure the actual bandwidth where SDD11 & 21 crosses to determine bandwidth. The LeCroy WaveExpert 100,000 horizontal sampling points increase the impedance and Delta F S-parameter resolution on long transmission lines.
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| For package testing with the LeCroy WaveExpert, order the GPMMA adapter for your Gigaprobes(tm) from DVT Solutions, LLC. The Cascade Ez-probe can be ordered from LeCroy. |
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| The LeCroy WaveExpert 18ps TDR pulser provides the resolution to measure single and differential impedance in package testing. The fast TDR rise time is also a benefit in locating opens/shorts for package failure analysis. Add a vacuum chuck to hold down the package and you have a total package and FA test system. Contact your LeCroy account manager for a demo. |
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| TDR Measurement of Package Trace Path |
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Click on this LINK for more training on TDR and S-parameter measusrements and get the full application presentaion of the above TDR applicaions.
For more information call your local LeCroy Account Manager for a demonstration on your interconect design or visit Lecory.com |
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