A Schmitt trigger circuit is a comparator circuit with a hysteresis. Consider the Schmitt trigger circuit in the figure implemented using an opamp. What are the trigger levels for this circuit?
- $\pm \frac{R_{1}}{R_{2}} V_{s}$
- $\pm \frac{R_{2}}{R_{1}} V_{s}$
- $\pm \frac{R_{1}}{R_{1}+R_{2}} V_{s}$
- $\pm \frac{R_{2}}{R_{1}+R_{2}} V_{s}$
- None of the above