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  2. Bode plot - Wikipedia

    en.wikipedia.org/wiki/Bode_plot

    Figure 1B: Low-pass filter (1st-order, one-pole) Bode magnitude plot (top) and Bode phase plot (bottom). The red data curve is approximated by the straight black line. In electrical engineering and control theory, a Bode plot is a graph of the frequency response of a system.

  3. Pole–zero plot - Wikipedia

    en.wikipedia.org/wiki/Pole–zero_plot

    A pole-zero plot shows the location in the complex plane of the poles and zeros of the transfer function of a dynamic system, such as a controller, compensator, sensor, equalizer, filter, or communications channel. By convention, the poles of the system are indicated in the plot by an X while the zeros are indicated by a circle or O.

  4. Phase margin - Wikipedia

    en.wikipedia.org/wiki/Phase_margin

    Bode plot illustrating phase margin. In electronic amplifiers, the phase margin (PM) is the difference between the phase lag φ (< 0) and -180°, for an amplifier's output signal (relative to its input) at zero dB gain - i.e. unity gain, or that the output signal has the same amplitude as the input.

  5. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    In electronics, cutoff frequency or corner frequency is the frequency either above or below which the power output of a circuit, such as a line, amplifier, or electronic filter has fallen to a given proportion of the power in the passband.

  6. Marginal stability - Wikipedia

    en.wikipedia.org/wiki/Marginal_stability

    A continuous system having imaginary poles, i.e. having zero real part in the pole(s), will produce sustained oscillations in the output. For example, an undamped second-order system such as the suspension system in an automobile (a mass–spring–damper system), from which the damper has been removed and spring is ideal, i.e. no friction is ...

  7. Bode's sensitivity integral - Wikipedia

    en.wikipedia.org/wiki/Bode's_sensitivity_integral

    Bode's sensitivity integral, discovered by Hendrik Wade Bode, is a formula that quantifies some of the limitations in feedback control of linear parameter invariant systems. Let L be the loop transfer function and S be the sensitivity function .

  8. Why kids have imaginary friends — and what it means - AOL

    www.aol.com/news/why-kids-imaginary-friends...

    Kids having imaginary friends is a normal part of play, and one California psychologist shares what having an imaginary companion means, and when to seek help. Why kids have imaginary friends ...

  9. Frequency response - Wikipedia

    en.wikipedia.org/wiki/Frequency_response

    Magnitude response of a low pass filter with 6 dB per octave or 20 dB per decade roll-off. Measuring the frequency response typically involves exciting the system with an input signal and measuring the resulting output signal, calculating the frequency spectra of the two signals (for example, using the fast Fourier transform for discrete signals), and comparing the spectra to isolate the ...

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