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Teraspeed Measurement Based IBIS Modeling Process

Teraspeed Measurement Based IBIS Modeling Process. Tom Dagostino VP Modeling Teraspeed Consulting Group LLC Device Modeling Division. Measurement Process Overview. Collect data on component Develop a test plan Design a test fixture Measure the characteristics required

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Teraspeed Measurement Based IBIS Modeling Process

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  1. Teraspeed Measurement Based IBIS Modeling Process Tom Dagostino VP Modeling Teraspeed Consulting Group LLC Device Modeling Division  2002 Teraspeed Consulting Group LLC

  2. Measurement Process Overview • Collect data on component • Develop a test plan • Design a test fixture • Measure the characteristics required • Enter data into the system • Build model • Test model  2002 Teraspeed Consulting Group LLC

  3. Develop Test Plan • From the data collected determine • Which pins to measure • Which techniques are required to stimulate the output(s) • JTAG • Test vectors • Etc. • Determine if a new test fixture is required  2002 Teraspeed Consulting Group LLC

  4. Develop a Test Fixture • Supply clean power to the device • Access to pins that need to be driven • Access to pins that need to be measured • Any support circuitry required to operate the device  2002 Teraspeed Consulting Group LLC

  5. Measurement Process • VT data • 50 Ohms to ground and acquire rise and fall • 50 Ohms to Vcc and acquire rise and fall • Preserve timing relationships between waveforms  2002 Teraspeed Consulting Group LLC

  6.  2002 Teraspeed Consulting Group LLC

  7. Measurement Process • IV Data • Place output in high state • Sweep from 0 to Vcc + 1.2 Volts • Place output in low state • Sweep from –1.2V to Vcc • If appropriate get input or tri-state • Sweep from –1.2 to Vcc + 1.2 Volts  2002 Teraspeed Consulting Group LLC

  8.  2002 Teraspeed Consulting Group LLC

  9. Original Measurement Load Line Final Pulldown curve Extracted Ground Clamp Extrapolated endpoints  2002 Teraspeed Consulting Group LLC

  10. Collect Component Data • Pin data • Number • Signal • Package parasitics • Electrical specification • Timing test load • Diff pin pairs • Etc.  2002 Teraspeed Consulting Group LLC

  11.  2002 Teraspeed Consulting Group LLC

  12. Build Model • Build model • Check with IBIS Golden Parser • Load and check in a simulator  2002 Teraspeed Consulting Group LLC

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