Finding the Cutoff Frequency for RL High-Pass/Low-Pass Filters

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In summary, the formula to find the cutoff frequency for an RL High-Pass/Low-Pass Filter is Fc = R/(2πL). This differs from the formula used for RC filters, which is 1/(2ΩRC). However, if anyone is ever looking for it, the correct formula for RL filters is Fc = R/(2ΩL). Please note that the symbol for pi may appear as an omega, but copying and pasting the correct text will display the correct symbol.
  • #1
Petrucciowns
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Does anyone know the formula to find the cutoff frequency for an RL High-Pass/ Low-Pass Filter?

I know with RC filters it's 1/ (2ΩRC) ,but this does not work for RL filters.
 
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  • #2
I figured it out, but if anyone is ever looking for it it's:

Fc (Cutoff frequency) = R/ ( 2π L)
 
Last edited:
  • #3
Petrucciowns said:
I figured it out, but if anyone is ever looking for it it's:

Fc (Cutoff frequency) = R/ ( 2ΩL)

Your PI symbol is coming out as an Omega...
 
  • #4
FYI, if you copy-and-paste the text on the right below, you'll get a nice looking pi symbol:

π .. [noparse]π[/noparse]
 
  • #5
That's wierd, but it's all fixed. Thanks for pointing it out.
 

What is an RL High-Pass/Low-Pass Filter?

An RL High-Pass/Low-Pass Filter is a type of electronic circuit that allows certain frequencies of an alternating current (AC) signal to pass through while blocking others. It consists of a resistor (R) and an inductor (L) connected in series, with the output taken across the inductor for a high-pass filter and across the resistor for a low-pass filter.

How does an RL High-Pass/Low-Pass Filter work?

An RL High-Pass/Low-Pass Filter works by exploiting the properties of resistors and inductors. Resistors impede the flow of current, while inductors resist changes in current. In an RL filter, the inductor will allow high-frequency signals to pass through easily, while the resistor will block them. The opposite is true for low-frequency signals.

What are the applications of RL High-Pass/Low-Pass Filters?

RL High-Pass/Low-Pass Filters have various applications in electronics, including audio signal processing, power supply filtering, and communication systems. They are also used in radio frequency (RF) circuits to select specific frequencies for transmission or reception.

What are the advantages of using an RL High-Pass/Low-Pass Filter?

The main advantage of using an RL High-Pass/Low-Pass Filter is its simplicity. It only requires two components, making it easy to design and implement. It also has a relatively low cost compared to other types of filters. Additionally, it has a wide frequency range and can be easily modified to meet specific filtering needs.

What are the limitations of RL High-Pass/Low-Pass Filters?

One limitation of RL High-Pass/Low-Pass Filters is that they have a limited ability to attenuate certain frequencies. This means that they may not be able to completely block unwanted frequencies. They also have a limited range of frequencies that they can effectively filter. Additionally, they can introduce signal distortion and phase shifts, which may affect the overall performance of the circuit.

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