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Definition of "Cutoff Frequency" |
The 3dB point of a filter at which point the filter starts to attenuate the signal. The frequency either above which or below which the output of a circuit, such as a line, amplifier, or filter, is reduced to a specified level, normally 0.707 times the maximum gain. The frequency at which the attenuation of a waveguide increases sharply and below which a traveling wave in a given mode cannot be maintained. A frequency with a half wavelength that is greater than the wide dimension of a waveguide. The frequency that marks the pass-band of a filter. / 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. / A pulse transformer is a transformer that is optimised for transmitting rectangular electrical pulses that is, pulses with fast rise and fall times and a relatively constant amplitude. / See cut-off frequency. |
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