ROSE HULMAN INSTITUTE OF TECHNOLOGY Department of Electrical and Computer Engineering EC 300 Signals and Systems Fall 2000 B A Black Filter Design by Wayne T Padgett Objectives To 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 Equipment HP34401 Multimeter HP8116A Function Generator Tektronix 2215A Oscilloscope Opamps TL072 MC33072 or equivalent Resistors and capacitors as needed Pre Lab Do 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 the specifications Procedure Build both filters Measure the frequency response of each filter using the LabView virtual instrument FreqRsp llb Note FreqRsp llb is identical to InsertionLoss llb except that it calculates voltage gain rather than insertion loss Present and compare your measured and simulated results by plotting them together on the same graph You can import PSPICE frequency response data into MATLAB by doing the following Importing PSPICE frequency response data into MATLAB 1 Attach the PRINT1 device to your filter s output terminal Double click on the symbol and set the analysis option to AC 2 Run the simulation then select Analysis Examine Output Scroll down to the numerical frequency response values then highlight the entire set of values with the cursor and do CtrlC to copy them to the clipboard 3 In MATLAB start entering a matrix variable assignment command e g A BAB 10 11 00 1 14 PM Lab7 doc Page 1 of 2 EC 300 Signals and Systems Fall 2000 4 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 using semilogx A 1 20 log10 A 2 Report Make sure that your lab notebook contains clear fully documented schematics of your final filter designs Also include a sketch of the frequency response measurement setup Tape in the frequency response graphs for each filter Comment on the accuracy of your designs Have all members of your lab group sign the lab notebook and hand the notebook in at the end of lab BAB 10 11 00 1 14 PM Lab7 doc Page 2 of 2
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