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| Build on your solderless breadboard the Band reject filter circuit presented in Figure 3. | Build on your solderless breadboard the Band reject filter circuit presented in Figure 3. |
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| {{ :university:courses:electronics:bsf_circuit.png?600 |}} | {{ :university:labs:bsf_circuit.png?600 |}} |
| <WRAP centeralign>Figure 3: Band reject filter circuit</WRAP> | <WRAP centeralign>Figure 3: Band reject filter circuit</WRAP> |
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| {{ :university:courses:electronics:bsf_bb.png?900 |}} | {{ :university:labs:bsf_bb.png?900 |}} |
| <WRAP centeralign>Figure 4: Breadboard connections of Band reject filter circuit</WRAP> | <WRAP centeralign>Figure 4: Breadboard connections of Band reject filter circuit</WRAP> |
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| The band stop filter's frequency response can be plotted using the Network Analyzer tool. Compute the center frequency of the filter using equation (4). According to this you will set the start and stop frequencies of the logarithmic sweep. For this filter the center frequency is 3.3 KHz. In the network analyzer set the start frequency at 1 KHz and the stop frequency at 10 KHz. Set the minimum phase at -90 the maximum phase at 90. Magnitude axis can be set from -30 dB to 10dB. In Figure 5 is presented the transfer function of the filter obtained by running the network analyzer. | The band stop filter's frequency response can be plotted using the Network Analyzer tool. Compute the center frequency of the filter using equation (4). According to this you will set the start and stop frequencies of the logarithmic sweep. For this filter the center frequency is 3.3 KHz. In the network analyzer set the start frequency at 1 KHz and the stop frequency at 10 KHz. Set the minimum phase at -90 the maximum phase at 90. Magnitude axis can be set from -30 dB to 10dB. In Figure 5 is presented the transfer function of the filter obtained by running the network analyzer. |
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| {{ :university:courses:electronics:bsf_freq_plot.png?900 |}} | {{ :university:labs:bsf_freq_plot.png?900 |}} |
| <WRAP centeralign>Figure 5: Frequency response of Band reject filter circuit</WRAP> | <WRAP centeralign>Figure 5: Frequency response of Band reject filter circuit</WRAP> |
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| In the Signal Generator tool, on Channel 1, generate a waveform with the frequency value in the rejection interval of the filter and analyze it's response. Observe on the oscilloscope channel 1 the input signal and the output signal on channel 2. In Figure 6 you can see the filter input and output for a 3kHz sine waveform. | In the Signal Generator tool, on Channel 1, generate a waveform with the frequency value in the rejection interval of the filter and analyze it's response. Observe on the oscilloscope channel 1 the input signal and the output signal on channel 2. In Figure 6 you can see the filter input and output for a 3kHz sine waveform. |
| {{ :university:courses:electronics:bsf_3k_signal.png?900 |}} | {{ :university:labs:bsf_3k_signal.png?900 |}} |
| <WRAP centeralign>Figure 6:Input and output signals of Band reject filter circuit for 3kHz input frequency</WRAP> | <WRAP centeralign>Figure 6:Input and output signals of Band reject filter circuit for 3kHz input frequency</WRAP> |
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