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What define Cgb Cdb in hspice simulation? Help!

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xiexi

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The Cgb and Cdb is defined by layout diffusion size which is AD, PD, AS, PS. But I am confused that when I simulate using level 49 model the Cgb and Cdb exist without writing AD, PD, AS, PS parameter. I wonder how to defind these parameters in hspice program if I don't write them. Thanks!
 

i think cgd cdb cgs is include in the models not in the spice file.
you can use lx18 - lx34 see it (details in hspice mannual)
 

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    xiexi

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Hi dear friend
You can specify device characteristics for default values. you can see more information in hspice manual. the default values are determined in technology file.

See this picture :



Regards
 

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    xiexi

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xiexi said:
The Cgb and Cdb is defined by layout diffusion size which is AD, PD, AS, PS. But I am confused that when I simulate using level 49 model the Cgb and Cdb exist without writing AD, PD, AS, PS parameter. I wonder how to defind these parameters in hspice program if I don't write them. Thanks!
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If you dont define AD,PD,AS,PS, spice will use the default settting. They can be calculated by the W, L
 

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    xiexi

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