Creating a Parameterized Cell in Cadence

[storyee]

Hi all,

I am creating ideal Parameterized comparator cell, which has parameters of voltage gain, positive supply, negative supply, However, After create the symbol for the comparator, when I instance that comparator to a new schematics, when I assign a value to the positive supply area, the voltage unit can not auto-generate, is there a way to auto-generate the voltage unit "V"? is that means cadence wont consider " positive supply" as voltage parameter? thanks for any help.

 

[JoannesPaulus]

No, the parameters are interpreted by your code. They could be anything. Unless you use callback functions you cannot automatically add "V" in this field.

 

[storyee]

No, the parameters are interpreted by your code. They could be anything. Unless you use callback functions you cannot automatically add "V" in this field.

Thanks, but I am not using code to generate ideal comparator, I am using vcvs to edit parameters as pPar("parameter"), any idea then?

thanks again for you reply

 

[JoannesPaulus]

The callback (probably) does not recognize a string as a voltage but when the parameter is passed it will be interpreted correctly.

 

[lawduk]

Hi there,

Actually you can get the "V" added by creating appropriate CDF for the cell and adding a parameter for the "positive supply" and "negative supply" PCell parameters (although I guess that you have already done this, since the form seems to be showing the prompt rather than a parameter name).
Make sure that the parameter is of type "string" and set the units to "voltage" - inside your PCell code, use something like cdfParseFloatString() to convert the string value to a floating point number.

Regards.