# Signal Period of each stage in a ring oscillator

Considering the following ring oscillator:

I know that the Frequency at $$\Q\$$ is given by $$f=\frac{1}{2*t_{PD}*3}$$
Yet I want to calculate the period of each signal at $$\V_{1}\$$,$$\V_{2}\$$, and $$\V_{3}\$$. Is there a formula to do so or am I just missing something?

• They all have the same period, 1/f. The only difference is the phase. Unless I'm not understanding the question ... – Dave Tweed Feb 21 '19 at 0:36
• What I wanted to ask is whether the formula for $f$ is valid only for the last stage or for all the stages at $V_1$, $V_2$, and $V_3$. – billyandriam Feb 21 '19 at 0:40