Filter Design Made Simpler with Filter DesignGuide

Filter Design Made Simpler with Filter DesignGuide


ADS comes with a powerful filter design
guide to help you create filters according to your specifications. The filter design guide is a great
starting point for your filter designs, and you can easily tweak the parameters
and translate your designs from lumped components to transmission lines. We will
use the filter smart component to design our filter. In this example, we’ll make a bandpass filter. In the filter DG-all palette, place the corresponding filter. Select the component and go to design
guide, filter, then select the filter control window. We have a number of filter types that we
can choose from in the drop down menu. Today we’ll create a Chebychev filter. The Ap
parameter is the attenuation of the pass band and the As parameter is
attenuation of the stop band. We’ll leave the passband attenuation at 3 DB but
we’ll design a filter with an increased attenuation at the stop band. We can also set FS1 and FS2 which are
the edge frequencies of the bandpass, as well as FP1 and FP2 which are the pass
band frequencies. Of course if you’re defining a low-pass and high-pass filter, you only have one band pass and one pass
band frequency parameter. Note that the graph of the filter
response has shifted as a result of the change in attenuation and parameters. In
addition, the order of the circuit necessary to have this response has been
recalculated. We can update the smart component by
pressing design. You can run a simulation of this filter without having to go to
the trouble of editing the schematic. This would come in handy when you’re
designing the smart component in a larger network of an existing schematic. Go to
the simulation assistant tab. You can set the frequency sweep that you want for
your filter simulation, but the assistant can also autoset the frequencies for you.
Press simulate once you’re satisfied with the settings. In the top left we have the s-parameter
2, 1 response of this filter in DB. The gray line is for the specifications
that we set, while the blue line is the actual simulated response. In the top
right, we have frequency parameters that we
inputted to specify the filter, as well as some of the performance indicators
and the result of the markers from the plot. In the bottom we have a few plots
that can quickly give us an idea of the performance of this filter. If you want
to alter the schematic of the filter manually or check the values set, you can
do so after you’ve created the design in the design guide. Just pop into the hierarchy
of the filter. We can see the design generated by the design guide. Let’s go back out to the top level. We
can easily change the components to a transmission line model. Go back to the
design guide window. Then select on the transmission utility. If we select the LC to TLine option, we
can change existing L and C components to TLine equivalents. Let’s change our inductor capacitor
series. The blue indicates what will give us the best frequency response. We’ll select
the open circuit stub. We’ll also convert all instances of the
LC parallel circuit. We see now that our components have been
changed to transmission lines. Back in the filter design guide tool, we can
resimulate the t-line design in the simulation assistant tab. If you want to
revert to the lumped components simply press design again. I’ll simulate
the new design with transmission lines. We can now see the new response of the
filter. As with any smart component, the schematic for the generated design from
the design guide is created in the same workspace. We can access this schematic
from the main window. Thank you for watching this Keysight EEsof EDA tutorial. You can find a link to a free trial of ADS in the video
description below.

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