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EEL6323-S10-HLec011-Circuit-SimsModels-4spp

EEL6323-S10-HLec011-Circuit-SimsModels-4spp - Lecture 11...

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1 Lecture 11: Circuit Simulations Circuit Characterization (Brief) Reading: Ch. 5 IV curves: Basic Shapes IDS vs VDS (two regions) – Linear (Low V DS ) • Effective Resistance – Saturated (High V DS ) • Current, g m , g ds IDS vs VGS – Linear IDS (above threshold) – Log (IDS) (below threshold) SPICE Level 1 Model Shichman-Hodges Model (Schichman68) – Similar to Shockley model, but with channel length modulation and body effect  saturation V V V V V V LAMBDA L W KP linear V V V V V V V V LAMBDA L W KP cutoff V V I t gs ds t gs ds eff eff t gs ds ds ds t gs ds eff eff t gs ds 2 1 2 2 1 0 SPICE Level 1 Model SPICE Level 1 Model SPICE Level 2 and 3 – Includes velocity saturation, mobility degradation, subthreshold conduction, drain induced barrier lowering BSIM Models – Berkeley Short-Channel IGFET Model (BSIM) – IGFET – Insulated Field Effect Transistor (i.e. MOSFET) – BSIM 3.v3 = SPICE level 49 • More then 100 parameters and device equations!
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