# [SOLVED]Bode plots

#### dwsmith

##### Well-known member
I am trying to construct the Bode plots for $$H(s) = \frac{s}{s + 2}$$.

For the magnitude Bode plot, $$H(i\omega) = \frac{1}{1 - i\frac{2}{\omega}}$$ and the decibel gain expression is
$A_{\text{vdB}} = -10\log\bigg(1 + \frac{4}{\omega^2}\bigg).$
So this plots the first Bode plot, but I am not sure how to setup the phase/frequency Bode plots.

I have been following https://en.wikipedia.org/wiki/Bode_plot but I dont know what $$\omega_c$$ is. Therefore, I can't $$\varphi$$.