how to estimate the terminal capacitance of a MOS tansister

[frankwen]

as the title
in common souce,the Cgd must mutiplite gain?
how about the Cgs and the Cgb
the DC point prints a Cgg
what does this mean?
thanks
best wishes

 

[erikl]

Re: how to estimate the terminal capacitance of a MOS tansis

the DC point prints a Cgg what does this mean?

Don't know the Search function? E.g. see here.

 

[frankwen]

Re: how to estimate the terminal capacitance of a MOS tansis

the DC point prints a Cgg what does this mean?

Don't know the Search function? E.g. see here.

thanks
but when Cgg=Cgd+Cgs+Cgb
how should I consideration the Cgd when the transister works in a common source case
I mean does Miller effect work here?
Cgd=Cgd'*gm*ro?
or Cgd=Cgd'
when Cgd and Cgd' is the capacitance before and after the Miller effect
thanks again
best wishes

 

[erikl]

Re: how to estimate the terminal capacitance of a MOS tansis

... when the transister works in a common source case, I mean does Miller effect work here?

Yes!

Cgd=Cgd'*gm*ro?

Right!

 

[frankwen]

Re: how to estimate the terminal capacitance of a MOS tansis

thank you very much
thanks

... when the transister works in a common source case, I mean does Miller effect work here?

Yes!

Cgd=Cgd'*gm*ro?

Right!