Questions about bsim3v3 parameters

[cjupiter]

I just wanted to know if i can use the channel length modulation coefficient for a bsim3v3 transistor (pclm) when calculating the output resistance of the transistor. Since ro is approx 1/lambda x Id. Can i use the pclm value here instead of lambda. The reason i ask is because lambda for level 1,2 etc models is usually around 0.01, whereas pclm values are sometimes greater than one.

Ta

 

[alastair41]

Re: bsim3v3 parameters

lamda is process dependent. Of course, it depends on the channel length also. To get an approximation of lamda, you got to simulate the I-V curve of the transistor.

 

[forrestchen]

Re: bsim3v3 parameters

I think you can not just replace PCLM with LAMDA for Ro calculation

 

[terryssw]

Re: bsim3v3 parameters

PCLM used in BSIM3v3 is a parameter in very-complex model equation, not just as simple as 1+lamda*Vds and thus completely different from lamda.

 

[lmlee]

bsim3v3 parameters

to alastair41

you mean that the lamda can olny be got from simulation? right?

thanks

 

[ue]

Re: bsim3v3 parameters

in my opinoion

bsim3 v3 has complex model for calculation of lambda

but rd= (lambda*Id)^(-1) also remain valid for for first design guess
though for actual lambda one can use simulated response of transister.

and for perticularly answer original query i don't think lamda value in practice ever exceed unity. though in some transister regime of operation you can make try some approximation.

 

[layes]

Re: bsim3v3 parameters

forget lamda pls

 

[v_naren]

Re: bsim3v3 parameters