Editing Bode plot (section)

===Phase plot===
The phase Bode plot is obtained by plotting the phase angle of the transfer function given by

: <math>\arg H_{\text{lp}}(\mathrm{j} \omega) = -\tan^{-1}\frac{\omega}{\omega_\text{c}}</math>

versus <math>\omega</math>, where <math>\omega</math> and <math>\omega_\text{c}</math> are the input and cutoff angular frequencies respectively. For input frequencies much lower than corner, the ratio <math>\omega/\omega_\text{c}</math> is small, and therefore the phase angle is close to zero. As the ratio increases, the absolute value of the phase increases and becomes −45° when <math>\omega = \omega_\text{c}</math>. As the ratio increases for input frequencies much greater than the corner frequency, the phase angle asymptotically approaches −90°. The frequency scale for the phase plot is logarithmic.