[SI-LIST] Re: Model of Capacitors

> Dear all:
> I have one question about decoupling effect of caps. When the voltage on
> the caps is changing, does the decouling effect of capacitor change?

Simple answer, Yes!  Lots!

This why anyone using a capacitor value as anything other than a first
order approximation is fooling themselves.  There are many effects based
upon temperature, voltage, history, age, diaelectric, etc.

This is also why a bypass type capacitor should never, ever, be used in a
critical value circuit (such as resonate circuits).

If you have any doubt about the classification of a capacitor take a look
at its tolerance.  Many bypass caps have a tolerance of +80/-20%!

Fred Townsend
>
> For example, there is one capacitor, 10uF/100V. I measure its model by
> means of VNA at low voltage. When the capacitor is used to decouple
> -48V, could the model of caps be used?
>
> Best Regards
>
> Zhangkun
> 2003.08.29
>
>
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