LTspice capacitance model

[yxue]

hi guys,
is there anyone familiar with LTspice model file? i wanna create a Level-1 model file for transistor simulation, but i donnot know how to add parasitic capacitance model into transistor, which can be used for frequency response simulation. anyone can help me? please, thank you guys.

 

[erikl]

See Table 4-11 from the HSPICE® Elements and Device Models Manual: View attachment HSPICE_Elements_and_Device_Models_Manual_p122.pdf
Valid for LTspice just as well.

 

[yxue]

i add these parameters into my .model file, and than run .op simulation, but it showed that the Cgs, Cgd......are always zero, could you please explain how can make LTspice to calculate these parasitic capacitances?thank you

 

[erikl]

Did you specify Tox ? See the SwitcherCAD III manual p. 136 .