2 high-pass filters with different R and C values, discuss the differences

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In summary, the conversation discusses two high-pass filters with different R and C values and whether they have any differences in response. The speaker initially speculates that there may be differences due to transient response, but then realizes that since the cut-off frequency is the same for both filters, there should be no differences in response. The conversation ends with the question of what the exact wording of the question is and the speaker expressing frustration with receiving an answer sheet that states there are no differences between the filters.
  • #1
liam1992
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You have two high-pass filters with different R and C values discuss the difference in the response.

Filter a) R=5kΩ C=250μf
Filter b) R=25kΩ C=50μf

I calculated that they have the same cut-off frequency but without actually testing the circuit on Multisim and connecting a bode plotter I don't know how to find any differences
 
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  • #2
Just speculating here, but if the cut-off frequency were the same, shouldn't the response here be the same?

If not, then I assume any differences in response would be due to a transient response due to the different capacitances. Just speculation though.
 
  • #3
That's what I thought but the cut off frequency is proportional to 1/RC and the RC value for both circuits is the same. It could be transient response but I don't know much about it because we haven't been taught anything about it
 
  • #4
Sketch each filter as a 2 port network, and label input and output.

➤ Consider input impedance.
 
  • #5
Your subject say "discuss the differences", your post says "discuss the difference in the response".

What is the exact wording of the question?
 
  • #6
The question says discuss the differences in the response. It's alright now, the lecturer sent us an answer sheet and the answer was there is no differences, they are identical. I hate it when they do that.
 

FAQ: 2 high-pass filters with different R and C values, discuss the differences

1. What is the purpose of using two high-pass filters with different R and C values?

The purpose of using two high-pass filters with different R and C values is to create a more complex filter that can better attenuate specific frequencies. By combining the two filters, the resulting frequency response will have a steeper slope and a sharper cutoff compared to using a single high-pass filter. This allows for more precise filtering of certain frequencies.

2. How do the R and C values affect the performance of a high-pass filter?

The R and C values in a high-pass filter determine the cutoff frequency, which is the frequency at which the filter begins to attenuate the signal. A higher R value or a lower C value will result in a lower cutoff frequency, while a lower R value or a higher C value will result in a higher cutoff frequency. Additionally, the R and C values also affect the slope of the filter's frequency response curve, with higher values resulting in a steeper slope.

3. What are the main differences between using two high-pass filters with different R and C values and using a single high-pass filter?

The main difference is in the frequency response of the filters. Using two high-pass filters with different R and C values will result in a steeper slope and a sharper cutoff compared to using a single high-pass filter. This means that the combined filter will have better attenuation of specific frequencies. Additionally, using two filters allows for more flexibility in adjusting the cutoff frequency and slope by changing the R and C values of each filter.

4. Can you give an example of a situation where using two high-pass filters with different R and C values would be beneficial?

One example is in audio processing, where a high-pass filter can be used to remove unwanted low-frequency noise from a signal. By using two filters with different R and C values, the resulting frequency response can be tailored to specifically attenuate the low-frequency noise while preserving the desired frequency range of the signal.

5. Are there any drawbacks to using two high-pass filters with different R and C values?

One potential drawback is the added complexity and cost of using two filters instead of one. Additionally, if the R and C values are not chosen carefully, the combined filter may have unintended effects on the signal, such as altering the phase or introducing distortion. Therefore, it is important to carefully design and test the combined filter to ensure it meets the desired specifications.

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