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maximum power - RF Cafe Forums
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dipak
Post subject: maximum power Posted: Thu Dec 14, 2006 11:36
am
Captain
Joined: Tue Nov 14, 2006 7:21 pm
Posts:
9
Location: Nagpur(M.S)
can you tell me various design consideration
for getting higher power for the power amplifier?
how should
i increase the power of amplifier?
Top
IR
Post
subject: Posted: Thu Dec 14, 2006 4:30 pm
Site Admin
Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
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.
You
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
several countours.
Hope this helps!
_________________
Best regards,
- IR
Posted 11/12/2012 |
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