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Validation of EIAJ IMIC Models

Validation of EIAJ IMIC Models. Raj Raghuram Applied Simulation Technology IBIS Summit Dec. 7, 1998. Summary. What is IMIC and Introduction Advantages of IMIC Validation Procedure Validation for MC74LCX245 Validation for TI 16233.cbt Conclusions . Validation Procedure.

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Validation of EIAJ IMIC Models

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  1. Validation of EIAJ IMIC Models Raj Raghuram Applied Simulation Technology IBIS Summit Dec. 7, 1998

  2. Summary • What is IMIC and Introduction • Advantages of IMIC • Validation Procedure • Validation for MC74LCX245 • Validation for TI 16233.cbt • Conclusions

  3. Validation Procedure • Find driver with SPICE model • Convert the .model statement to and equivalent Table .model statement • Run the circuit with original model for different loads • Run the circuit with Table .model for different loads and compare with above

  4. Example 1: Motorola 74LCX245 • Low Voltage CMOS Octal Transceiver • 3 V supply used • Tristate non-inverting output • Pins are Oebar, T/R, A0-A7, and B0-B7 • Package model is just an inductance • 24 mA driving capability • Pulse with 1ns tr, 1ns delay, and 9ns width

  5. MC74LCX245 with 500 W-5 pF load to ground V(590) out Volts ns

  6. MC74LCX245 with 50 W load to ground V(590) Volts out ns

  7. MC74LCX245 with 50 W load to VCC out V(590) Volts ns

  8. MC74LCX245 with 500 W load at the end of a 50 W-1 ns Tline out V(590) Volts ns

  9. 16233.cbt with a 5 pf- 1 kW load at the end of 65 W-1 ns Tline IMIC model from ASPICE IMIC model from HSPICE Original BSIM1 model Volts ns

  10. How is the IMIC model made? • We use SPICE to do it. • 3D DC sweep printing capacitors and I at each step. • Ensure RD,RS, RSH =0 in doing the run • For Generic SPICE have to do a number of runs - a AC analysis at each step or operating point to get capacitances

  11. Conclusions • IMIC model viable SPICE-like alternative with proprietary information protection • Validation has been done for different loads with two different devices. Waveforms from the IMIC model and original SPICE model overlay quite well.

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