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TRANSISTOR FOR EFFICIENT 900 MHz, 100mW PA ? - RF Cafe Forums
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STEVER
Post subject: TRANSISTOR FOR EFFICIENT 900 MHz, 100mW PA
?
Unread postPosted: Thu Sep 02, 2004 6:59 am
Any suggestions
on a nice transistor for a PA at 900MHz with good efficiency? Spec:-
Pout: 50 to 100 mW
Supply rail: 3 Volts
Frequency: 900 MHz
Bandwidth: Narrowband
Class: Probably C or harmonic terminated etc
(need best efficiency)
Efficiency: Target of better than 60%
Transistor
type: Fet or Bipolar
Size: Small parts preferred
Cost: Not critical
Top
GUEST
Post subject: Any suggestions on a
nice transistor for a PA at 900MHz with
Unread postPosted: Thu Sep
09, 2004 2:08 pm
I've had some great luck with an Infineon BFP450
at those levels, efficiencies and frequencies. Hint
use a constant
current source bias.
Top
GUEST
Post subject:
100 mW amp
Unread postPosted: Sat Sep 11, 2004 9:03 am
Don't
know if this is better, the efficiency may be a bit off,
but talk
about simple...
[url]http://www.semiconductors.philips.com/acrobat/datasheets/BGA6589_1.pdf
[/url]
Top
Guest - IFX
Post subject:
Unread
postPosted: Sat Sep 11, 2004 11:42 pm
Dear Guest,
Use
only Infineon BFP450 for your application. It is very stable and easy
to tune to 900MHz.
It is a SiGe Device with Ft of 25GHz
Datasheet:
http://www.infineon.com/cmc_upload/docu ...
bfp450.pdf
Application Notes:
http://www.infineon.com/cmc_upload/migr
... pli026.pdf
More Info:
http://www.infineon.com/cgi/ecrm.dll/ec
... ?oid=13759
If you need more gain add BFP420 / BFP 520
/ BFP 620 as a driver to your +20dBm PA.
With Best Regards,
Guest - IFX
Top
STEVE
Post subject:
Unread postPosted: Mon Sep 13, 2004 9:12 am
Thanks to you all,
Strange (or maybe not) but I ended up prototyping a BFP450 amp last
week. Performance is reasonable without trying very hard (circa 45 to
50% collector eff') but quite a bit harder to get any more efficiency
than that. I tried a harmonic termination of 2F and then 3F but this
did not gain me much for quite a bit more complexity!
Thanks
again anyway
Posted 11/12/2012
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