BSIM3v3.2.2 MOSFET Model - The University of Texas at Dallas

Single Current Expression for All Operating Regimes of Vgs and Vds(3.6.2)VACLM=A E L + VPCLMAbulkEsatlitlbulk sat eff gsteff( Vds−Vdseff)Similarly, Eq. (3.5.7) now becomesV⎛ −Plitl⎞exp⎜⎟⎝ Vds−Vdseff⎠1 scbe2 scbe1ASCBEP=Leff(3.6.3)The V dseff expression is written as2( δ ( δ)4δ)1V = V − V −V − + V −V − + V2dseff dsat dsat ds dsat ds dsat(3.6.4)The expression for V dsat is that given under Section 3.4. The parameter δ in theunit of volts can be extracted. The dependence of V dseff on V ds is given in Figure 3-3. The V dseff function follows V ds in the linear region and tends to V dsat in thesaturation region. Figure 3-4 shows the effect of δ on the transition region betweenlinear and saturation regimes.BSIM3v3.2.2 Manual Copyright © 1999 UC Berkeley 3-13