Typical application for zener diodes is as __________.

Typical application for zener diodes is as __________.

• A. Signal demodulation
• B. Rectification
• C. Voltage regulators
• D. Power switching

Answer: (C)

The main idea is using a Zener diode as a voltage reference to regulate voltage. When a Zener diode is reverse-biased and driven into its breakdown region, its voltage stays nearly constant over a wide range of current. This makes it perfect for holding a circuit node at a stable voltage, even if the supply varies or the load changes. In a simple regulator, current from the supply flows through a series resistor into the Zener and the load in parallel. If the input voltage or load changes, the Zener conducts more or less to keep the output voltage at its rated breakdown value. For higher currents or tighter regulation, the Zener is often used with a transistor to boost current while preserving the stable reference. Other options aren’t typical roles for Zeners. Demodulation relies on diodes and filters to extract information from a signal, not on clamping to a fixed voltage. Rectification uses diodes to convert AC to DC, primarily through forward conduction, not the reverse breakdown behavior of Zeners. Switching devices are designed for turning currents on and off with efficiency and speed that Zeners don’t provide.

The main idea is using a Zener diode as a voltage reference to regulate voltage. When a Zener diode is reverse-biased and driven into its breakdown region, its voltage stays nearly constant over a wide range of current. This makes it perfect for holding a circuit node at a stable voltage, even if the supply varies or the load changes.

In a simple regulator, current from the supply flows through a series resistor into the Zener and the load in parallel. If the input voltage or load changes, the Zener conducts more or less to keep the output voltage at its rated breakdown value. For higher currents or tighter regulation, the Zener is often used with a transistor to boost current while preserving the stable reference.

Other options aren’t typical roles for Zeners. Demodulation relies on diodes and filters to extract information from a signal, not on clamping to a fixed voltage. Rectification uses diodes to convert AC to DC, primarily through forward conduction, not the reverse breakdown behavior of Zeners. Switching devices are designed for turning currents on and off with efficiency and speed that Zeners don’t provide.