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why do ground body pin of R, C & L in CMOS

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tomhive

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hi guys,
i am highly confuse that why do ground body pin of R, C & L in CMOS device, but i know the reasion for actice device. but 4 passive i dont know the reasion.
thanks
 

Hi tomhive

I am not quite sure what you mean. I could guess.
Can you give us any examples?

regards ... Polymath
 

calculate the parasitic parameter of the passive device
 

I don't know your means.
 

tomhive said:
hi guys,
i am highly confuse that why do ground body pin of R, C & L in CMOS device, but i know the reasion for actice device. but 4 passive i dont know the reasion.
thanks
Click to expand...

In order to model the parasitic effect of these passive devices we need 3 terminals.... Now, the question is where do we want to connect our third terminal.... Actually the connection of the third terminal is not necessarily to GND.... take p-diffusion resistor for example.... we need to connect the body to the VDD...... But most third terminal of the devices are connected to GND..... This is because we take substrate as our reference..... And this substrate is connected to GND or the lowest potential in our chip......
 

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