Question
What device is used as a stable voltage reference?
Answer Options
- A) A Zener diode
- B) A digital-to-analog converter
- C) An SCR
- D) An analog-to-digital converter
Correct Answer: A
Explanation
Electronic circuits, particularly voltage regulators and measuring devices, require a highly precise and stable voltage source against which all other voltages can be compared or measured. This reference voltage must be immune to changes in load, input voltage, and temperature.
A Zener diode is the device most commonly used as a stable voltage reference. When operating in its reverse breakdown region, the Zener diode maintains an extremely constant voltage drop across its terminals, even when the current flowing through it varies significantly. This stable voltage characteristic is critical for the feedback loop in a voltage regulator circuit.
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