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Low Pass/High Pass Filter Calculator
A passive filter (also known as a lumped element filter) is used to attenuate a signal above or below a determined frequency. This passive filter calculator has you pick your composition (RC – Resistance/Capacitive, RL – Resistance/Inductance) and enter your values to calculate the cutoff/-3dB frequency. Depending on the configuration of the components you can construct a low pass or high pass filter. The low-pass filter will pass a signal with minimal distortion up to the cutoff frequency, at which point it will block the input signal. The high-pass filter will block the frequencies below the cutoff frequency and pass the ones above.
Filter Type
RC Filter Formulas
RL Filter Formulas
LC Filter Formulas
Lumped element filters are composed of Resistors, Inductors and Capacitors. They allow frequencies to pass above or below a predetermined level. The level at which the frequency is attenuated by -3dB (70.7%) is called the cutoff frequency.
While building lumped element filters it is important to understand the effect each element has on the signal. The resistor element is mostly frequency independent. The inductor increases in impedance as the frequency increases, while the capacitor decreases in impedance as the frequency gets faster. With these different dynamics in place consideration must be paid to the configuration of the filter in order to achieve the desired frequency response.
A first order filter is one that contains only one active (inductor or capacitor) element. A second order filter will contain two active elements and has twice the frequency roll off. RC filters are typically used for filtering lower power signals.
While building lumped element filters it is important to understand the effect each element has on the signal. The resistor element is mostly frequency independent. The inductor increases in impedance as the frequency increases, while the capacitor decreases in impedance as the frequency gets increases. With these different dynamics in place consideration must be paid to the configuration of the filter in order to achieve the desired frequency response.
A first order filter is one that contains only one active (inductor or capacitor) element. A second order filter will contain two active elements and has twice the frequency roll off. RC filters are typically used for filtering lower power signals.
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