Teraspeed Measurement Based IBIS Modeling Process - PowerPoint PPT Presentation

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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