[sdiy] Does Source = Drain???

[ASSI]

On Sunday 13 June 2010, David G. Dixon wrote:
> All the other datasheets I had on hand only listed Ciss, as does
> Table 3.1 in Horowitz and Hill.  Does this imply that Coss is the
> same, or that nobody in their right mind would ever be stupid
> enough to hook the damn things up backwards, and therefore Coss is
> irrelevant?

Ciss and Coss are not the same as Cgs and Cgd.  The latter two are 
internal device parameters that refer to parasitic capacitances, the 
former two are effective capacitances for a specific circuit 
configuration and bias point (Ciss - input capacitance in open source 
configuration, Coss - output capacitance in same circuit).

AN211A gives more details on this.


Achim.
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