Re: RF PA low pass filter component ratings.

From: Paul Burridge (pb_at_notthisbit.osiris1.co.uk)
Date: 09/25/04 

Date: Sat, 25 Sep 2004 13:30:40 +0100

On 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. 

-- 
"What is now proved was once only imagin'd." - William Blake, 1793.

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