Hi, I am Richard Overdorf with Agilent (Keysight) Technologies. Today, I am here to show you
the wideband analysis solution. This is a new capability that offers one GHz worth of
bandwidth. It is an easy to use solution that features automatic correction data. This solution
is very useful for people in electronic warfare, radar, or wideband communication systems.
Today I am going to show you how this solution works, but let us first get started looking
at the configuration. So the setup consists of three things. The first is a PXA signal
analyzer, the second is a high dynamic range oscilloscope, and finally the 89600 vector
signal analysis software. The PXA’s IF output is connected to the channel one of the oscilloscope.
In addition, there is a LAN cable connected between the oscilloscope and the PXA signal
analyzer. Also, we have a wideband arbitrary waveform generator and a vector PSG to generate
these wideband signals. The M8190’s IQ – differential IQ outputs are connected to the vector PSG’s
IQ modulator, which then up converts a signal up to 44 GHz. Our analysis solution can demodulate
or analyze signals up to 50 GHz. Next, let me show you how the VSA software controls
the hardware. So here we see the VSA software, and we are going to go into the Macro menu,
and we are going to select the wideband tuner, and we are going to run the wideband tuner,
and this software component is going to pop up a screen where you enter the IP address
of the tuner, which in this case is the signal analyzer. So you type in the IP address, and
then you hit the button that says, “Connect to PXA”, and then after you do that, It
is going to set up the VSA software and control the PXA. Then you set your center frequency,
your RF span, and pick your IF frequency. In this case, we are going to do 800 MHz,
so we are going to change this IF frequency to 500 MHz. When you hit the set button, it
configures the VSA software and controls the PXA signal analyzer. You can see that I have
a CW signal at 10 GHz. Next I am going to go into the input menu and I am going to show
you where the software component added in the correction files. There’s an RF correction
file, an IF correction file, and in the middle there is a frequency converter section that
puts the IF center frequency as well as the IF bandwidth, and it inverts our spectrum,
so everything is set up on the VSA software as it should be. And you can notice in the
background it also has the right span and center frequency in the VSA screen. So we
have a signal at 10 GHz. Now I am going to start that signal to sweep across the screen.
So after we sweep across the screen, what I want to do is show kind of an indication
of how well the IF corrections perform versus not having any corrections. I am going to
select the Peak Hold value in the Averages menu, and I am going to do a continuous peak.
So every sample on the screen is going to be at its maximum based on what is measured.
Now I am going to change the reference value and change how many dB we have per division
so we can easily see subtle differences from the amplitude across the band. So you can
see that this is with the corrections off, and we have approximately slightly less than
10 dB worth of variation across the band, and when I turn the correction values back
on – So this is the stuff that the software component added. Now you can see that our
variation is 2 dB. This includes the amplitude variance from the source, and it is also is
a family correction. This is not a box specific correction. This correction could likely be
better in your setting. So now we are going to go back to our software component and I
am going to set up the PXA to have a center frequency of 18 GHz, and a span of 400 MHz,
and a IF frequency of 322.5. In this case, I am going to have the user corrections on,
and the converter already implemented all of the corrections that we need. And I am
going to input a QPSK signal, and I am going to demodulate that, and I am going to show
you what that performance looks like. I am going to pause the measurement, and the EVM
is around 2.5%. Next, I am going to demodulate the APSK signal, and so I am going to recall
this set up. I am going to go into a wider span. First I am going to show you user corrections
off, and then I am going to show you with the user corrections on. With the user corrections
off, you can see that we are unable to demodulate the signal. In the demodulated properties,
we have the symbol rate. We do not have an equalization filter on. In the Advanced tab,
we have to find the APSK ring ratios. Next I want to show you the corrected version.
You can see in this case we have a EVM of about 3.3%. This signal is likely to have
a inherent EVM of somewhere between 2 and 3%, meaning the residual EVM of the system
is pretty low. Today I showed you the wideband analysis solution. We showed wideband analysis
signals up to 1 GHz, carrier frequencies of 50 GHz, and we showed that it was easy to
use and also easy to set up. For more information on this product, please see the URL on your
screen, and thanks for watching.