The Schmitt trigger circuit shown in the figure below uses Zener diode with Vd = 0.7 V. If the threshold voltage V1 is zero and hysteresis voltage VH = 0.2 V, then what is \(\frac{{{R_1}}}{{{R_2}}}\) and VR?

The Schmitt trigger circuit shown in the figure below uses Zener diode

1.	The Schmitt trigger circuit shown in the figure below uses Zener diode with Vd = 0.7 V. If the threshold voltage V1 is zero and hysteresis voltage VH = 0.2 V, then what is \(\frac{{{R_1}}}{{{R_2}}}\) and VR?
A.	R1/R2 = 6 and VR = 0.15 V
B.	R1/R2 = 67 and VR = -0.15 V
C.	R1/R2 = 66 and VR = -0.10 V
D.	R1/R2 = 66 and VR = -0.15 V
Answer» D. R1/R2 = 66 and VR = -0.15 V