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What is the purpose of the Zener diode in a voltage reference circuit?
Question

What is the purpose of the Zener diode in a voltage reference circuit?

A.

To regulate the current through the circuit

B.

To provide a stable reference voltage by operating in reverse breakdown

C.

To amplify the input signal

D.

To block reverse current flow

Correct option is B

A Zener diode is specifically designed to operate in its reverse breakdown region without being damaged. In this mode, once the voltage across it reaches a specific, predetermined level (the Zener voltage, (VzV_{z}​), it maintains a nearly constant voltage across its terminals, even with significant variations in the current flowing through it. This ability to provide a stable, fixed voltage makes it ideal for use as a voltage reference in power supplies and other precision circuits. 

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