Correct Answer - Option 2 : linear feedback control system only
Bode Diagrams or Logarithmic Plots:
Bode diagram consists of two graphs:
- One is a plot of the logarithm of the magnitude of a sinusoidal transfer function; the other is a plot of the phase angle;
- both are plotted against the frequency on a logarithmic scale.
The Bode magnitude plot is the graph of the function |H(s=jω)| of frequency ω. The ω-axis of the magnitude plot is logarithmic and the magnitude is given in decibels, i.e., a value for the magnitude|H| is plotted on the axis at 20 log10|H|.
The Bode phase plot is the graph of the phase, commonly expressed in degrees, of the transfer function arg(H(s = jω)) as a function of ω. The phase is plotted on the same logarithmic ω -axis as the magnitude plot, but the value for the phase is plotted on a linear vertical axis.
The Bode-diagram approach is one of the most commonly used methods for the analysis and synthesis of linear feedback control systems.
