## Explain the level 2 large signal model parameters.

Ans. In this condition

Where the cut-off transition region can be calculated as

The parameter V_{max} is used to characterize the saturation/ohmic transition region. It is the maximum drift velocity of carrier in the channel. If V_{max} is not input, the saturation/ohmic transition region can be defined as

The parameter K’_{2} can be determined as

Where _{s} denotes the effective mobility. The parameter DELTA is a SPICE input parameter and is used to characterized width reduction, WR = W –W _{eff}, where the effective width, W_{eff}, is defined by W_{eff} = W(2 – ).

The parameter _{S} can be defined as –

The parameter can be defined as –

Where

And where XJ denotes a SPICE input parameter representing the metallurgical junct5ion depth.

The parameter L_{eff} can be given as –

L_{eff} = L_{adj} (1 – V_{DS})

If not specified as an input parameter, can be determined as

The parameter X_{D} can be defined as

The parameter _{s} can be defined as

The parameters UCRIT, UEXP and UTRA are SPICE input parameters used to characterize mobility degradation.