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the length and width selection of MOSFET

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eng_hayder82

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how can i select the length and width of the MOSFET from Lmin,Lmax,Wmin,Wmax for 90 nm model parameters?
 

Those min/max params are your "box". What you do within that
box, depends on what you want from the device - leakage, drive,
linearity / flatness, loading and so on.

The basic "how" is, you set the properties of the instance you
place in whatever capture tool you are using. But I think maybe
"what" and "why" are not understood either?
 

eng_hayder82 said:
how can i select the length and width of the MOSFET from Lmin,Lmax,Wmin,Wmax for 90 nm model parameters?
Click to expand...


Any Model file provided by foundry has its limitation regarding sizes of transistors and other component. Either reading their design documents or using them in simulator (for example use virtuoso and test it by enter value for nMOS W or L and so on). Finger is one way to go beyond the general limit .

Every technology node has its own limitation in terms of dimension of device.
 

thanks all for response
i want to design and simulate two-stage CMOS op-amp FOR 90nm technology by hspice to see the specification degradation after 10 year.
but when I choose the L and W valuse in element model the simulator give warning ( *warning** (op_amp_open_loop.sp:26) Model nmos1 device geometries will not be checked against the limits set by lmin, lmax, wmin and wmax. To enable this check, add a period(.) to the model name(i.e. enable model selector) and ( **warning** (nmos1:m1) Warning: Acde = 0.33437 may be too small in BSIM4 model with w=4.865e-006 l=3.5e-006. )
 

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