Help me with calculating channel length: where is K and &amp

[yihsiu]

keta + tsmc25n

hi

dose someone know where the K and λ are?
because i need to know that to calculate the channel length for nmos pmos.

* LOT: n94s WAF: 08
* Temperature_parameters=Default
.MODEL tsmc25N NMOS ( LEVEL = 11
+VERSION = 3.1 TNOM = 27 TOX = 5.8E-9
+XJ = 1E-7 NCH = 2.3549E17 VTH0 = 0.4308936
+K1 = 0.3519429 K2 = 0.0298493 K3 = 1E-3
+K3B = 0.0592323 W0 = 1E-5 NLX = 1.465901E-7
+DVT0W = 0 DVT1W = 0 DVT2W = 0
+DVT0 = 0.0183405 DVT1 = 4.897584E-3 DVT2 = -0.0252658
+U0 = 455.3033362 UA = 5.223592E-10 UB = 1.104713E-18
+UC = 3.287888E-11 VSAT = 1.050993E5 A0 = 1.2318623
+AGS = 0.3043334 B0 = 6.67749E-8 B1 = 5E-6
+KETA = 8.518046E-4 A1 = 0 A2 = 1
+RDSW = 509.5675851 PRWG = 0.0227558 PRWB = -1E-3
+WR = 1 WINT = 2.126497E-9 LINT = 4.393474E-9
+XL = -3E-8 XW = 0 DWG = -3.409033E-9
+DWB = 2.794842E-9 VOFF = -0.1026054 NFACTOR = 0.1344887
+CIT = 0 CDSC = 1.527511E-3 CDSCD = 0
+CDSCB = 0 ETA0 = 3.48737E-3 ETAB = 4.557986E-4
+DSUB = 3.045473E-3 PCLM = 1.0446257 PDIBLC1 = 0.1441952
+PDIBLC2 = 4.513382E-4 PDIBLCB = -2.816756E-5 DROUT = 0.4698725
+PSCBE1 = 1.761109E10 PSCBE2 = 3.772916E-9 PVAG = 0.0361824
+DELTA = 0.01 MOBMOD = 1 PRT = 0
+UTE = -1.5 KT1 = -0.11 KT1L = 0
+KT2 = 0.022 UA1 = 4.31E-9 UB1 = -7.61E-18
+UC1 = -5.6E-11 AT = 3.3E4 WL = 0
+WLN = 1 WW = 0 WWN = 1
+WWL = 0 LL = 0 LLN = 1
+LW = 0 LWN = 1 LWL = 0
+CAPMOD = 2 XPART = 0.4 CGDO = 6.27E-10
+CGSO = 6.27E-10 CGBO = 0 CJ = 1.918655E-3
+PB = 0.9784049 MJ = 0.4721729 CJSW = 4.441595E-10
+PBSW = 0.9419636 MJSW = 0.2871118 PVTH0 = 1.342985E-3
+PRDSW = -61.8357222 PK2 = -3.140724E-3 WKETA = 7.512693E-4
+LKETA = -6.144062E-3 )

 

[aryajur]

Re: channel length ? help

λ is best found through simulation. Also are u trying to find the effective channel length or the rechnology channel length. The k u r talking about is it µ Cox W/L ??

 

[yihsiu]

channel length ? help

yes

 

[aryajur]

Re: channel length ? help

UO is µ and from TOX you can calculate Cox by the formula for the parallel plate capacitance Cox = ε εsi / Tox, where ε is 8.854*10^-12 and εsi = 3.9
µ has to be multpled by 10^-4 to get SI units of mobility.

 

[carlyou]

channel length ? help

aryajur,εsi=11.9, there is no λ in the most model, in Bsim3V3 model, there may be 4 or 5 parameters is correlative with the channel length, I agree with aryajur that you should do singal MOSFET to find a
experiential value.

 

[aryajur]

Re: channel length ? help

Ya sorry about the mistake εsi is 11.7 but εsiox is 3.9 and that is what you have to use to calculate capacitance so use εsiox.

 

[whuestc]

channel length ? help

i know

 

[ezt]

Re: channel length ? help

Hi.
I think just up to level 3 in MOS models include lambda parameter. after that there are some more detailed parameters to calculate rds. However, for simplification, usually designers express rds as a constant multiplied by 1/L (i.e. rds=a*1/L.) it's an approximation but still useful.
and about µnCox. I agree with others about the way to calculate Cox. U0 is µ0 and you should use a more accurate formula to calculate the µn, but U0 is a good approximation of the real µ.

Regards,
EZT

 

[layes2]

Re: channel length ? help

L=Ldraw-Ldd