Capacitance Model

Dimension Dependence

(-63)

(-64)

(-65)

(-66)

Junction Capacitance

If pd > W_eff,

(-67)

otherwise

(-68)

where

cjbs is a function of cj, mj, and pb

cjbssw is a function of cjsw, mjsw, and pbsw

cjbsswg is a function of cjswg, mjswg, and pbswg

Overlap Capacitance (for NMOS)

(-69)

(-70)

(-71)

If OverlapCgs/OverlapCgd < 0, OverlapCgs/OverlapCgd=1.0e-7*Tox

OverlapCgb<0, OverlapCgb=0

Source Overlap Capacitance

For capmod=0,

(-72)

For capmod=1,

if (V_gs < 0),

(-73)

else

(-74)

For capmod=2,

(-75)

Drain Overlap Capacitance

For capmod=0,

(-76)

For capmod=1,

if (V_gd < 0),

(-77)

else

(-78)

For capmod=2 or 3,

(-79)

(-80)

Gate Overlap Charge

(-81)

Intrinsic Charges

For capmod=0

Accumulation region (V_gs < V_fb + V_bs)

(-82)

(-83)

(-84)

Subthreshold region (V_gs < V_th)

(-85)

(-86)

(-87)

Strong inversion (V_gs > V_th)

(-88)

(-89)

(-90)

(-91)

50/50 Charge Partition

(-92)

If

(-93)

(-94)

(-95)

(-96)

(-97)

otherwise,

(-98)

(-99)

(-100)

40/60 Channel-Charge Partition

If V_ds < V_dsat,

(-101)

(-102)

(-103)

(-104)

(-105)

otherwise,

(-106)

(-107)

(-108)

(-109)

0/100 Channel-Charge Partition

If V_ds < V_dsat,

(-110)

(-111)

(-112)

(-113)

(-114)

otherwise,

(-115)

(-116)

(-117)

(-118)

For capmod=1

if V_gs < V_fb + V_bs + V_gsteffcv,

(-119)

else

(-120)

(-121)

(-122)

(-123)

(-124)

(-125)

(-126)

If V_ds ≤ V_dsat,

(-127)

(-128)

50/50 Charge-Channel Partition

(-129)

40/60 Channel-Charge Partition

(-130)

(-131)

0/100 Channel-Charge Partition

(-132)

(-133)

If V_ds > V_dsat,

(-134)

(-135)

50/50 Channel-Charge Partition

(-136)

40/60 Channel-Charge Partition

(-137)

(-138)

0/100 Channel-Charge Partition

(-139)

(-140)

For capmod=2

(-141)

(-142)

(-143)

(-144)

(-145)

(-146)

(-147)

(-148)

(-149)

(-150)

(-151)

(-152)

(-153)

(-154)

50/50 Charge Partition

(-155)

40/60 Channel-Charge Partition

(-156)

(-157)

0/100 Charge Partition

(-158)

(-159)

For capmod = 3

capmod = 3 supports only zero-bias V_fp; that is, V_fb is calculated from bias-independent V_th, regardless of the version number. This is different from capmod = 1 and 2.

(-160)

(-161)

(-162)

(-163)

where

(-164)

(-165)

(-166)

(-167)

(-168)

(-169)

(-170)

(-171)

(-172)

(-173)

(-174)

(-175)

(-176)

(-177)

(-178)

(-179)

(-180)

(-181)

(-182)

(-183)

(-184)

(-185)

(-186)

50/50 Charge Partition

(-187)

40/60 Charge Partition

(-188)

(-189)

0/100 Charge Partition

(-190)

(-191)

Intrinsic Capacitances (with Body Bias and DIBL)

(-192)

(-193)

(-194)

(-195)

Related Topics

BSIM3v3 Level-11 Model (bsim3v3)

LOD Model

Nonquasi-static (NQS) Model

SPICE3 Junction Diode Model

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