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Rose-Hulman ECE 300 - Filter Design

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ROSE-HULMAN INSTITUTE OF TECHNOLOGYDepartment of Electrical and Computer EngineeringEC 300 Signals and Systems Fall 2000B.A. BlackBAB 10/11/00 1:14 PM Lab7.doc Page 1 of 2Filter Designby Wayne T. Padgett ObjectivesTo carry out a complete filter design by doing the following steps:1. Design a filter using a handbook approach.2. Verify the design using a numerical simulation (e.g. PSPICE)3. Build the design in hardware.4. Verify that the circuit meets specifications by direct measurement using LabView.The above design process will be carried out for both Butterworth and Chebyshev filter types.EquipmentHP34401 MultimeterHP8116A Function GeneratorTektronix 2215A OscilloscopeOpamps: TL072, MC33072, or equivalentResistors and capacitors as neededPre-LabDo problems 11.26 and 11.29 in Eccles. Verify your designs using PSPICE.Record your designs in your lab notebook. Include plots that show your filters meet thespecifications.ProcedureBuild both filters. Measure the frequency response of each filter using the LabView virtualinstrument FreqRsp.llb. (Note: FreqRsp.llb is identical to InsertionLoss.llb, except that itcalculates voltage gain rather than insertion loss.)Present and compare your measured and simulated results by plotting them together on the samegraph. You can import PSPICE frequency response data into MATLAB by doing the following:Importing PSPICE frequency response data into MATLAB1. Attach the “PRINT1” device to your filter’s output terminal. Double-click on the symbol andset the “analysis” option to “AC”.2. Run the simulation, then select “Analysis → Examine Output”. Scroll down to the numericalfrequency response values, then highlight the entire set of values with the cursor, and do Ctrl-C to copy them to the clipboard.3. In MATLAB, start entering a matrix variable assignment command, e.g., A=[EC 300 Signals and Systems Fall 2000BAB 10/11/00 1:14 PM Lab7.doc Page 2 of 24. Paste the clipboard contents into MATLAB using Ctrl-V.5. Close the variable assignment by typing ];6. Plot the data. If you wish, you can get a Bode plot usingsemilogx(A(:,1),20*log10(A(:,2))).ReportMake sure that your lab notebook contains clear fully documented schematics of your final filterdesigns. Also include a sketch of the frequency response measurement setup. Tape in thefrequency response graphs for each filter. Comment on the accuracy of your designs. Have allmembers of your lab group sign the lab notebook, and hand the notebook in at the end of


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Rose-Hulman ECE 300 - Filter Design

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