The saturated output voltages of the comparator in the circuit shown in Figure 15.33 are \(\pm 10 \mathrm{~V}\). Assume forward diode voltages of \(0.7 \mathrm{~V}\) and reverse Zener voltages of \(5.6 \mathrm{~V}\). The range of the input voltage is \(-2 \leq v_{I} \leq+2 \mathrm{~V}\).

(a) Find \(R_{1}\) and \(R_{2}\) such that the hysteresis width is \(0.6 \mathrm{~V}\). The minimum resistance value is to be \(4 \mathrm{k} \Omega\).

(b) Find \(R\) such that the maximum current through the diodes is \(0.8 \mathrm{~mA}\).

Figure 15.33:-

Transcribed Image Text:

(Vy+Vz) R VIL iVTH ww R + Dzi ww Dz2 R (a) (Vy+Vz) (b) Figure 15.33 (a) Schmitt trigger with Zener diode limiters and (b) voltage transfer characteristics