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sweeping w/L ratio

whlinfei

Hi all,

 I am new to cadence and I tried to sweep a mosfet w/L ratio under a dc sweep. ( for every w/l , a gate bias dc analysis is run from 0 to Vdd).

However I tried to define my variable as "param" to indicate the number of fingers so that I could change the total width but couldt get the result.

 Can anyone help me with this ? 

I am using vurtuoso schematic to design and vurtuoso analog design environment to simumlate. 

Parents

  •  Are you sweeping number of fingers (i.e. Width of single finger) for a fixed W (i.e. Width of all fingers)? I don't think you can do that in IBM8RF unless you edit the CDF parameters as Andrew mentioned. There are many parameters in the model defined by "Width of all fingers" and "Length" in the instance properties. If you're with MOSIS ask them if theres a way to do this. support@mosis.com or http://tech.groups.yahoo.com/group/MOSIS_Users_Group/. Also in the CDSLIB users guide there is a section on CDF parameters, you might want to take a look at that.

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  •  Are you sweeping number of fingers (i.e. Width of single finger) for a fixed W (i.e. Width of all fingers)? I don't think you can do that in IBM8RF unless you edit the CDF parameters as Andrew mentioned. There are many parameters in the model defined by "Width of all fingers" and "Length" in the instance properties. If you're with MOSIS ask them if theres a way to do this. support@mosis.com or http://tech.groups.yahoo.com/group/MOSIS_Users_Group/. Also in the CDSLIB users guide there is a section on CDF parameters, you might want to take a look at that.

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