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Hello, my name is Riadh Said, I am an engineer at Agilent Technologies. Power amplifier designers
have been asking us for external level control to set the final output power of their amplifiers
when measuring ACPR and EVM. This is especially important when you are measuring technologies
such as LTE or wireless LAN with high peak to average ratios because to get the performance
you need, you typically run into a non-linear range of those amplifiers, and as a result,
your gain is also non-linear. I would like to introduce you to a new feature called Power
Servo in the X-Series signal generators. So let's see how this works. In our demo setup,
we have the MXG going into the amplifier. Then we have a directional bridge that goes
directly into the spectrum analyzer. Then we are going to couple off this bridge into
the power sensor. The power sensor is connected to the back of the MXG signal generator. So
now, let's configure the MXG for external leveling. If you go under the amplitude key,
leveling control, we will configure the power meter servo configuration. In this menu, you
are going to actually configure your power meter and calibrate any system losses and
offsets for the power sensor in the bridge. Once you have done that, the next thing you
will want to do is set your settling error. In this case, we want it to be within 0.1
dB of the final request of power. Next, go to our leveling mode. In this case, you have
two choices. Power Meter Once or Power Meter Continuous. Let's select Power Meter Continuous.
Once in this mode, you are now leveling your external amplifier, so you are getting within
0.1 dB even in the non-linear range of the amplifier. So you just saw how you can automatically
level the output of your amplifier with power meter accuracy using the X-Series Power Servo
feature. This will save you time and effort, eliminating repetitive measurement tasks.
To learn more about the X-Series, please visit the URL on your screen. Thank you for watching.