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university:courses:alm1k:circuits1:alm-cir-9 [06 Oct 2018 17:26] – [Frequency response plots with ALICE Bode Plotter] Doug Mercer | university:courses:alm1k:circuits1:alm-cir-9 [03 Nov 2021 20:18] (current) – [Activity: Band Pass Filters] Doug Mercer | ||
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The Band Width of frequencies passed is given by: | The Band Width of frequencies passed is given by: | ||
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All the frequencies below f< | All the frequencies below f< | ||
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To show how a circuit responds to a range of frequencies a plot of the magnitude ( amplitude ) of the output voltage of the filter as a function of the frequency can be drawn. It is generally used to characterize the range of frequencies in which the filter is designed to operate within. Figure 2 shows a typical frequency response of a Band Pass filter. | To show how a circuit responds to a range of frequencies a plot of the magnitude ( amplitude ) of the output voltage of the filter as a function of the frequency can be drawn. It is generally used to characterize the range of frequencies in which the filter is designed to operate within. Figure 2 shows a typical frequency response of a Band Pass filter. | ||
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<WRAP centeralign> | <WRAP centeralign> | ||
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====Materials: | ====Materials: | ||
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1. Set up the filter circuit as shown in figure 1 on your solderless breadboard, with the component values R< | 1. Set up the filter circuit as shown in figure 1 on your solderless breadboard, with the component values R< | ||
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2. Set the channel A AWG Min value to 0.5 and Max value to 4.5V to apply a 4Vp-p sine wave centered on 2.5 V as the input voltage to the circuit. From the AWG A Mode drop down menu select the SVMI mode. From the AWG A Shape drop down menus select Sine. From the AWG B Mode drop down menu select the Hi-Z mode. | 2. Set the channel A AWG Min value to 0.5 and Max value to 4.5V to apply a 4Vp-p sine wave centered on 2.5 V as the input voltage to the circuit. From the AWG A Mode drop down menu select the SVMI mode. From the AWG A Shape drop down menus select Sine. From the AWG B Mode drop down menu select the Hi-Z mode. | ||
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Use the Start Frequency button to set the frequency sweep to start at 100 Hz and use the Stop Frequency button to the sweep to stop at 20000 Hz. Select CHA as the channel to sweep. Also use the Sweep Steps button to enter the number of frequency steps, use 100 as the number. | Use the Start Frequency button to set the frequency sweep to start at 100 Hz and use the Stop Frequency button to the sweep to stop at 20000 Hz. Select CHA as the channel to sweep. Also use the Sweep Steps button to enter the number of frequency steps, use 100 as the number. | ||
- | You should now be able to press the green Run button and run the frequency sweep. After the sweep is completed ( could take a few seconds for 100 points ) you should see something like the screen shot in figure | + | You should now be able to press the green Run button and run the frequency sweep. After the sweep is completed ( could take a few seconds for 100 points ) you should see something like the screen shot in figure |
Record the results and save the Bode Plot using your favorite screen capture tool and include it in your lab report. | Record the results and save the Bode Plot using your favorite screen capture tool and include it in your lab report. | ||
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- | To better understand the frequency characteristics of this parallel LC filter plot the low pass frequency response with just the capacitor (i.e. remove the inductor). Make the same frequency sweep and take a smap-shot of the gain ( CB-db - CA-dB ) and relative phase ( CA-CB ). Now plot the high pass frequency response with just the inductor (i.e. put the inductor back and remove the capacitor). The Bode plot in figure | + | To better understand the frequency characteristics of this parallel LC filter plot the low pass frequency response with just the capacitor (i.e. remove the inductor). Make the same frequency sweep and take a snap-shot of the gain ( CB-db - CA-dB ) and relative phase ( CA-CB ). Now plot the high pass frequency response with just the inductor (i.e. put the inductor back and remove the capacitor). The Bode plot in figure |
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====Questions: | ====Questions: | ||
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2. Graph the Frequency Response for each filter built in the lab. (Use the values recorded in the tabular column and graph with the frequency on a logarithmic scale). Compare this to the response obtained from the Bode Plot and comment. | 2. Graph the Frequency Response for each filter built in the lab. (Use the values recorded in the tabular column and graph with the frequency on a logarithmic scale). Compare this to the response obtained from the Bode Plot and comment. | ||
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+ | **Resources: | ||
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+ | * Fritzing files: [[downgit> | ||
+ | * LTSpice files: [[downgit> | ||
**For Further Reading:** | **For Further Reading:** |