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  2. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    In physics and electrical engineering, a cutoff frequency, corner frequency, or break frequency is a boundary in a system's frequency response at which energy flowing through the system begins to be reduced (attenuated or reflected) rather than passing through.

  3. Bode plot - Wikipedia

    en.wikipedia.org/wiki/Bode_plot

    The feedback gain at low frequencies and for large A OL is A FB ≈ 1 / β (look at the formula for the feedback gain at the beginning of this section for the case of large gain A OL), so an equivalent way to find f 0 dB is to look where the feedback gain intersects the open-loop gain. (Frequency f 0 dB is needed later to find the phase margin.)

  4. Spatial cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Spatial_cutoff_frequency

    As an example, a telescope having an f /6 objective and imaging at 0.55 micrometers has a spatial cutoff frequency of 303 cycles/millimeter. High-resolution black-and-white film is capable of resolving details on the film as small as 3 micrometers or smaller, thus its cutoff frequency is about 150 cycles/millimeter.

  5. Time constant - Wikipedia

    en.wikipedia.org/wiki/Time_constant

    In the frequency domain (for example, looking at the Fourier transform of the step response, or using an input that is a simple sinusoidal function of time) the time constant also determines the bandwidth of a first-order time-invariant system, that is, the frequency at which the output signal power drops to half the value it has at low ...

  6. Rise time - Wikipedia

    en.wikipedia.org/wiki/Rise_time

    The bandwidth is defined as = and since the lower cutoff frequency f L is usually several decades lower than the higher cutoff frequency f H, All systems analyzed here have a frequency response which extends to 0 (low-pass systems), thus f L = 0 f H = B W {\displaystyle f_{L}=0\,\Longleftrightarrow \,f_{H}=BW} exactly.

  7. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    The cutoff attenuation for Butterworth filters is usually defined to be −3.01 dB. If it is desired to use a different attenuation at the cutoff frequency, then the following factor may be applied to each pole, whereupon the poles will continue to lie on a circle, but the radius will no longer be unity. [8]

  8. Center frequency - Wikipedia

    en.wikipedia.org/wiki/Center_frequency

    In electrical engineering and telecommunications, the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies. It is usually defined as either the arithmetic mean or the geometric mean of the lower cutoff frequency and the upper cutoff frequency of a band-pass system or a band ...

  9. Cutoff (physics) - Wikipedia

    en.wikipedia.org/wiki/Cutoff_(physics)

    In theoretical physics, cutoff (AE: cutoff, BE: cut-off) is an arbitrary maximal or minimal value of energy, momentum, or length, used in order that objects with larger or smaller values than these physical quantities are ignored in some calculation.