Consider the Schmitt trigger with limiter, as shown in Figure 15.34. Assume the forward diode turn-on voltage \(V_{\gamma}\) is \(0.7 \mathrm{~V}\).

(a) Determine \(V_{\text {REF }}\) such that the bistable output voltages at \(v_{I}=0\) are \(\pm 5 \mathrm{~V}\).

(b) Find values of \(R_{1}\) and \(R_{2}\) such that the crossover voltages are \(\pm 0.5 \mathrm{~V}\).

(c) Taking \(R_{1}, R_{2}\), and the \(100 \mathrm{k} \Omega\) resistors into account, find \(v_{O}\) when \(v_{I}=10 \mathrm{~V}\).

Transcribed Image Text:

VREF 100 ww ww R D D2 1 1 1 ww 1 vo (VREF + 2Vy) VTH R R+ R R VTL =- (VREF+ +2V) R+R -VREF R -(VREF+2Vy) ww (b) (a) Figure 15.34 (a) Inverting Schmitt trigger with diode limiters and (b) voltage transfer characteristics (VREF+2V7) VI