Re: RF PA low pass filter component ratings.

From: Rene Tschaggelar (none_at_none.net)
Date: 09/25/04 

Date: Sat, 25 Sep 2004 13:38:51 +0200

Paul Taylor wrote:

> Hi All,
>
> Anyone know how you go about calculating the component ratings (not
> values) for use in RF PA low pass filters as I would like to design
> some filters for low power (5 watts) HF use using surface mount
> components.
>
> I guess you could take worse case operating conditions ie open or
> short circuit load providing a full reflection and then perform some
> kind of nodal analysis but not sure.
>
> Any help would be much appreciatted as relevant info seems very sparse
> or havn't I looked hard enough.

The power rating is dependent on the components.
Usually when they become saturated or nonlinear
or simply too hot.
Capacitors have a max voltage and possibly a max
current rating. Likewise the inductors.

Another point may be the heat dissipation in those
components. That'd need extensive modelling plus a
few measurements.

Rene 

-- 
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

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