R
Rene Tschaggelar
Guest
Paul Burridge wrote:
mount components. You may have to verify the parameters for
your frequency band though.
Eg a 100nF 1206 is good to 10MHz, above which it becomes
inductive.
Rene
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Ing.Buero R.Tschaggelar - http://www.ibrtses.com
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Whatever your HF is, yes, the mobile phones contain surfaceOn Sat, 25 Sep 2004 13:38:51 +0200, Rene Tschaggelar <none@none.net
wrote:
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.
Is it possible to get SM components suitable for HF?? I've built
several filters for that band and they all tend to be on the **large**
side.
mount components. You may have to verify the parameters for
your frequency band though.
Eg a 100nF 1206 is good to 10MHz, above which it becomes
inductive.
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net