[Amps] High current RF decoupling capacitors

[Ian White]

>
>I'm working on a high power amplifier design using high voltage
>switching MOSFETs. It all looks fine in LTspice (doesn't it always?)
>until I look at the PSU decoupling requirements. I need something of
the
>order of 100nF at 350V with a ripple current rating of 4.5A RMS at up
to
>10MHz.
>
>Do such things exist? What sort of construction should I be looking
for?
>
>Thanks,
>
>Alan G3XAQ

If you could parallel several of the 10nF 1kV disc ceramics by Murata,
they would handle the current easily. They don't have a formal RF
current rating but will handle at least 1.5A each at 1.8-50MHz with no
perceptible heating. 


73 from Ian GM3SEK


>-----Original Message-----
>From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Alan
>Ibbetson
>Sent: 03 January 2014 23:15
>To: amps at contesting.com
>Subject: [Amps] High current RF decoupling capacitors
>
>I'm working on a high power amplifier design using high voltage
>switching MOSFETs. It all looks fine in LTspice (doesn't it always?)
>until I look at the PSU decoupling requirements. I need something of
the
>order of 100nF at 350V with a ripple current rating of 4.5A RMS at up
to
>10MHz.
>
>Do such things exist? What sort of construction should I be looking
for?
>
>Thanks,
>
>Alan G3XAQ
>--
>
>Alan Ibbetson
>alan at g3xaq.net
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