Explain the level 2 large signal model parameters.

Explain the level 2 large signal model parameters.

Ans. In this condition

M

M

Where the cut-off transition region can be calculated as

M

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

M

 

The parameter K’2 can be determined as

M

Where Ms 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, Weff, is defined by Weff = W(2 –M ).

The parameter MS can be defined as –

M S =  M(1  – M)

The parameter  Mcan be defined as –

M

Where

 

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

The parameter Leff can be given as –

Leff = Ladj (1 – MVDS)

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

M

The parameter XD can be defined as

M

The parameter Ms can be defined as

M

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

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