Product Documentation
Spectre Circuit Simulator Components and Device Models Reference
Product Version 23.1, June 2023

Geometrical dependences, stress effects and junction asymmetry

Scaling Equations

Effective Dimension

Introduction of the number of fingers.

Effective length and width for current model.

Effective length and width of charge model.

Effective length and width for self heating.

Process Parameters

Gate-to-interface coupling parameters

Drain Induced Barrier Lowering Parameters

Mobility Parameters

Unlike in UTSOI1, UO is integrated into GE. This changes the signification of the THESAT related global parameters, as detailed in the Velocity Saturation Parameters section.

Series Resistance Parameters

Velocity Saturation Parameters

Since UO has been included in GE (see (Mobility Parameters), THESATL, in UTSOI2, is closely related to the saturation velocity itself.

Saturation and Channel Length Modulation Parameters

Gate Current Parameters

Unlike in UTSOI1, gate currents in overlap regions are not linked with LOVO in UTSOI2.

Gate Induced Drain/Source Leakage (GIDL/GISL) Parameters

For gate currents, GIDL/GISL currents are not linked with LOVO in UTSOI2, as compared to UTSOI1.

Charge Model Parameters

Self-heating Parameters

Noise Model Parameters

Stress Model

Effective SA/SB-related Parameters

Modification of Mobility-related Parameters

Modification of Threshold Voltage-related Parameters

Asymmetric Junctions

After the calculations described Scaling Equations and Stress Model, local parameters are clipped according to the min/max values of the parameters.

Then, if the switch parameter SWJUNASYM is equal to 0, drain and source junctions are assumed symmetrical and all parameters related to the drain junction are overwritten by their source side counterparts.

If SWJUNASYM=0:

If SWJUNASYM = 1, the parameters related to the drain side are kept unchanged.

If some of the drain side parameters are not specified in the model card, they take their default value and not the value of their source side counterpart.

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