Cut-Off Frequency Analysis On Resistance Values Variation In Low-Pass Filter And High-Pass Filter Circuits
Keywords:
Cut-Off Frequency, Feedback Resistance, Input Resistance, Low-Pass Filter, High-Pass FilterAbstract
Filter circuit was an electronic system used to filter signals at specific frequencies. In application, signal filtering is often imperfect due to shifts in the cut-off frequency caused by several components in the electronic circuit, one of which was the resistor component. Therefore, this research objective was to find the relationship between resistors and frequency changes to determine the cut-off frequency in low-pass and high-pass filter circuits. This research method used a series of LM741 op-amps by adding capacitor components and resistor variations as active low-pass filter and active high-pass filter circuits, each at the 1st and 2nd order, then connected to a function generator to provide frequency variations ranging from 100 Hz to 1 MHz. The results showed that for first-order low-pass filters, the optimal feedback resistance was 990 Ω, which yielded a cut-off frequency of 7546 Hz with a 3,16% error percentage. For the second-order configuration, a 9720 Ω resistance provided the best results, producing a cut-off frequency of 706.5 Hz with an error percentage of 35,4%. Similarly, for high-pass filters, the optimal resistance for the first-order configuration was 56,200 Ω, yielding a 275 Hz cut-off frequency and a 2,82% error percentage, while the second-order configuration performed best with an 82 Ω resistance, producing a cut-off frequency of 13.075,3 Hz with a 9,2% error percentage. These findings indicate that resistor values significantly influence the accuracy of cut-off frequency in active filter circuits.
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Data Availability Statement
All relevant data supporting the findings of this study are available within the article
