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BIRD95 Analysis Method

BIRD95 Analysis Method. Objective: match FD response of IBIS to transistor buffer IBIS and Transistor models analyzed using S-parameters IBIS model constructed using IBIS Center, templates C_comp at typical calculated at 0.51 pF HSPICE 2005.03, CosmosScope 2004.12 used for analysis

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BIRD95 Analysis Method

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  1. BIRD95 Analysis Method • Objective: match FD response of IBIS to transistor buffer • IBIS and Transistor models analyzed using S-parameters • IBIS model constructed using IBIS Center, templates • C_comp at typical calculated at 0.51 pF • HSPICE 2005.03, CosmosScope 2004.12 used for analysis • .LIN with 3 P-elements (Ports), each with Zo=50 Ω • Ports 1, 2 represent “pulldown” and “pullup” Z, respectively • Port 3 has a DC bias of 1.8 V, and represents supply Z • Models “float” – 100e6 Ω resistors connect to ideal “0” PU Port 2 Port 3 IO Port 1 By Michael Mirmak PD

  2. Results - Transistor

  3. Results – 100% PD C_comp

  4. Results – 50/50 PU/PD C_comp

  5. Model Version 1 • We take data on Port 1, Port 2 and Port 3 • We need Zpdn but do not measure it directly • Use Z-parameter conversion to obtain R+jX series RC PU WIP! ZPU Port2 ZPDN Port3 IO ZPD Port1 PD

  6. Next Steps • Build model of transistor impedances • All three ports are critical! • Add elements to IBIS model to match transistor • Ensure split C_comp ratio is set, understood for match • Compare vs. transistor and all-PD C_comp • Add I-T table behavior • This will account for crowbar currents • Use AMS languages to match behavior • See Arpad’s VHDL-AMS model results

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