Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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My Hobby Website:
maximum power - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: maximum power Posted: Thu Dec 14, 2006 11:36
Joined: Tue Nov 14, 2006 7:21 pm
can you tell me various design consideration
for getting higher power for the power amplifier?
i increase the power of amplifier?
subject: Posted: Thu Dec 14, 2006 4:30 pm
Joined: Mon Jun 27, 2005 2:02 pm
One possibility to increase the output power is to match the power
amplifier to maximal output power. You have to match the output to the
conjugate of the output impedance. This however might come on the expense
of other design paramaters like linearity or effieicncy.
can do Load-Pull measurements. This can be done with a Tuner or by using
a CAD tool e.g. ADS. The simulation results are countours of points
on the Smith Chart, which correspond to different output power levels.
This indicates to which impedance the output has to be matched in order
to obtain a certain output power. You can also do paramater sweep: frequency,
bias point to see how the output impedance changes and according to
that to synthesize the required matching network. In ADS for example,
you can get the contours for several paramaters like ACPR, IMD, output
power etc, and you can design a matching network to a certain impedance
which is a trade-off between several paramaters - the intersection of
Hope this helps!