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the AD,PD...of BSIM3V3 mosfet in hspice

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layan

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hi every body
i use the hspice model of BSIM3V3 mosfet(0.35 um of AMS).
how can i calculate the area and premeter of drain and source(AS and AD and PD and PS) of this mosfet for using in hspice?

thanks
 

layan said:
how can i calculate the area and premeter of drain and source(AS and AD and PD and PS) of this mosfet for using in hspice?
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If you use a PDK, they will be calculated automatically during netlisting. From a layout, the physical dimensions are extracted to create the appropriate netlists for LVS and postLayout simulation.
 

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    layan

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thanks but what is pdk?
 

layan said:
thanks but what is pdk?
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The Physical Design Kit (0.35 um of AMS)!
 

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    layan

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yes, but sorry i didnt get the answer of my first question ? :(
i put here the hspice model of this mosfet here
 

layan said:
i put here the hspice model of this mosfet here
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This is publicly available material. What should we do with it?
 

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    layan

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What are you using to draw the schematic and create the Spice netlist? Ideally that software would calculate AD PD etc from the design rules.

Keith
 

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    layan

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no i m writing the netlist myself
 

Ok. You will have to estimate it yourself. I presume you have the process layout rules? If you have a gds file of primitive devices that can help.

Either way, you need to find out how big the drain width and length need to be for a specific (minimum) size transistor. This could be 2um for a 0.8um process, for example. The other dimension will be the device width plus say 2um. From this you can work out ND, AD, PD etc.

For a first design pass you can omit them and just add them when you have sorted out the basic design.

I could be more specific with examples tomorrow but I am doing this on my mobile phone.

Keith
 

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    layan

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PDK=Process Design Kit
when you write netlist you should determine L and W if your model is 0.35um then L=0.35um and W must determine with yourself and your circuit properties.

if you need you can estimate with this equations:
AD = AS = 2.5*Lmin*W
PD = PS = 5*Lmin + W or 5*Lmin
 

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    layan

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