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Filter Designer
Filter designer helps to design different types of active filters by entering some specifications. We can generate Filter circuits in the schematic editor, which can be used as part of other circuits. The system library includes prototype circuits for active low-pass, high-pass, band-pass and band-stop filters. Filter Designer allows to select one of the variants of those filters (Chebyshev, Butterworth, Bessel, Elliptic (Cauer) or Ideal) and specify required filter output parameters: -frequency and quality range. The parameters (capacitance and resistance) for filter circuit components are calculated and updated in the circuit, which subsequently may be appended to the project.
Invoking Filter designer to design filters
1. From
Schematic Editor
select
Tools → Filter Designer
in the schematic editor.
2. Choose the desired filter from the tree view and then select the desired type from the drop down list.
Set the values for each parameter in the right pane
Quality range
Quality factor includes three options
–
Q<=5, 5< Q<=20, 20< Q
.
Output frequency
Output frequency should be in the range 10 Mill Hertz to 1 Giga Hertz.
Calculate parameters as
The drop down list includes Ideal values and Practical values
Component Parameters
Universal filter have the option to set the capacitance and resistance values.
Append mode
Append filter project to current page
Append filter project in new page, and the user can enter name of new page.
Append filter project as sub-circuit. The user has the option to enter the circuit name.
Merge input/output
To connect the input and output of filter to current nets in the project check the Merge input/output box.
3. After setting the parameters click on
Calculate Parameters
Button. Component parameters values are automatically calculated depending up on the output frequency.
4. Use the View Diagram tab to view the circuit.
5. Click on
Import Diagram
button. The Diagram of the filter will get tagged to the cursor, place the diagram in the required position on the work sheet.
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