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====== IIR Coefficient (Direct Coefficient Entry) ======
IIR Coefficient is an option on the [[resources:tools-software:sigmastudio:toolbox:filters:general2ndorder|General 2nd Order Filter]] algorithm that allows the user to manually enter IIR coefficients b0, b1, b2, a1, and a2.
===== Using the IIR Coefficient Option =====
  * Add a General (2nd order) filter from the toolbox to the schematic.
{{:resources:tools-software:sigmastudio:toolbox:filters:general2ndorder:screenhunter_01_jul._18_10.42.jpg?|}}
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  * Click on the blue icon in the middle of the cell to access the options.
{{:resources:tools-software:sigmastudio:toolbox:filters:general2ndorder:screenhunter_03_jul._18_10.43.jpg?|}}
{{:resources:tools-software:sigmastudio:toolbox:filters:general2ndorder:screenhunter_04_jul._18_10.43.jpg?|}}
  * In the drop-down menu, select IIR Coefficient.
{{:resources:tools-software:sigmastudio:toolbox:filters:general2ndorder:screenhunter_05_jul._18_10.44.jpg?|}}
  * Manually enter in the coefficient values.
{{:resources:tools-software:sigmastudio:toolbox:filters:general2ndorder:screenhunter_06_jul._18_10.45.jpg?|}}
  * Click the Load button to download the coefficients.
{{:resources:tools-software:sigmastudio:toolbox:filters:general2ndorder:screenhunter_07_jul._18_10.46.jpg?|}}
  * You can use the [[resources:tools-software:sigmastudio:toolbox:systemschematicdesign:simulationstimuli|Stimulus]] and [[resources:tools-software:sigmastudio:toolbox:systemschematicdesign:simulationprobe|Probe]] cells to check the magnitude and phase responses of the filter.
{{:resources:tools-software:sigmastudio:toolbox:filters:general2ndorder:screenhunter_08_jul._18_10.47.jpg?|}}
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