[SI-LIST] Re: diffusion capacitance measurement
- From: Yafei Bi <yafei_bi@xxxxxxxxx>
- To: Raymond.Leung@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Jul 2004 21:09:03 -0700 (PDT)
Ashvin,
Sounds like you already have the transistor model
files, so this is how I would do:
1). for a hand calculation, look at Hspice model file
for MOS parameter CJ and CJSW, those are bottom plate
and sidewall capacitance.
2). for a simulation, apply an AC voltage source at
the nodes(e.g.: drain/source), run .ac simulation,
probe the ac current goes into the nodes. the
impedance of nodes can be calaculated as:
R=V/I, I is your ac current.
impedance R=1/(2*pi*f*c).
you know the frequceny at which the current is
measured, so: c = I/(2*pi*f*V).
you can verify whether the simulation results matches
the hand calculation.
Alternatively, I agree with Raymond, just ask your
foundary, their documentation should have these number
readily.
Regards,
Yafei
--- Raymond.Leung@xxxxxxxxxxx wrote:
>
>
> Ashvin,
>
> You cannot calculate the area/perimeter diffusion
> capacitances
> accurately because they are very process dependent.
> There is a way
> to measure them out from the test devices which are
> specially
> designed for this purpose, but I don't think the
> faundry will let you
> do it yourself. Perhaps the best way is to ask your
> faundry for the
> figures.
>
> Regards,
> Raymond
>
>
>
>
>
> "ashvin khole" <ashvinkhole@xxxxxxxxxxx> on
> 14/07/2004 22:51:23
>
> Please respond to ashvinkhole@xxxxxxxxxxx
>
> To: si-list@xxxxxxxxxxxxx
> cc: (bcc: Raymond Leung/sdc)
>
> Subject: [SI-LIST] diffusion capacitance
> measurement
>
>
>
> Hi Can someone guide me to the appropriate way to
> measure area and
> perimeterdiffusion capacitance for a transistor
> model both by simulation and
> hand calculation? I have the appropriate model files
> for the transistor
> model. Thanks Ashvin
>
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