cutoff frequency


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cutoff frequency

[′kət‚ȯf ‚frē·kwən·sē]
(electronics)
A frequency at which the attenuation of a device begins to increase sharply, such as the limiting frequency below which a traveling wave in a given mode cannot be maintained in a waveguide, or the frequency above which an electron tube loses efficiency rapidly. Also known as critical frequency; cutoff.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Nonetheless, these noises are approximately 30 HZ and are removed using a low pass filter realized in hardware with a specified cutoff frequency of 33HZ.
Accordingly, in the proposed implementation of the constant-C tuning technique, switching the binary weighted transconductor arrays [G.sub.m3] and [G.sub.m4] sets the frequency range, while variation of the unit transconductance via the current divider [M.sub.r1_Gm3,4]-[M.sub.r2_Gm3,4] implements fine-tuning of the lower cutoff frequency, following equation
When the frequency of the generator is near the cutoff frequency of the filter, it is observed that the sinusoidal signal pass from the circuit.
As a result, in linear system the phenomenon that both effective and negative mass in bandgap and the phenomenon that cutoff frequency is effective zero mass should also exist in the nonlinear system However, none of the above has been reported.
When a signal consists of a true signal combined with noise, the residual will rise above the straight line as the cutoff frequency is reduced.
where [beta], [alpha], and [alpha]' are always real numbers and [[omega].sub.c] is the cutoff frequency defined by
In order to implement the proposed filter, firstly, the resonant frequency of the passband produced by the CSRRs based on the evanescent mode below the cutoff frequency of the SIW is calculated and designed.
With the increasing of [[omega].sub.[beta]], there will be two branches for TM modes and a low frequency (LF) mode with a lower cutoff frequency emerged as the new branch.
Below the cutoff frequency, the equivalent circuit of a SRR-loaded waveguide filter is mainly configured as a series capacitor and a parallel inductor, whereas the equivalent circuit of an evanescent-mode filter is configured as a parallel inductor and a parallel capacitor.
The input signal was filtered through LPF having variable cutoff frequency and slope controlling capability to obtain the bigger pulse width ratio and the more than minimum top pulse width of input signal depending on the belt conveyor speed.
On the basis of this analysis, an algorithm is proposed to adjust the cutoff frequency to reduce the amplitude error caused by the filter.