Topic: Analog Circuits
The output voltage (V_0) of the circuit shown in the given figure is (V1=13V, input resistor 1k, two 6.3V zener diodes connected back-to-back)
- A. zero
- B. 5.7 V
- C. 6.9 V
- D. 12.6 V
Answer: C. 6.9 V
Explanation: In a back-to-back zener diode configuration with an input of 13V, one zener diode will be forward-biased (acting as a normal diode with approximately 0.6V drop) and the other will be reverse-biased in its breakdown region (acting as a 6.3V voltage regulator). The total output voltage is the sum of these voltage drops: V_0 = 6.3V + 0.6V = 6.9V.