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Which of the following devices is used in voltage regulators and voltage limiters as a fixed reference voltage in the network?
- a)PIN diode
- b)Varactor diode
- c)Zener diode
- d)Tunnel diode
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
Which of the following devices is used in voltage regulators and volta...
The Zener diode operates just like the normal diode when in the forward-bias mode, and has a turn-on voltage of between 0.3 and 0.7 V. However when connected in the reverse mode, which is usual in most of its applications, a small leakage current may flow and the voltage across it is kept constant.
V - I characteristic of Zener diode
Zener as a Voltage Limiter:
V - I characteristic of Zener diode
Zener as a Voltage Limiter:
A resistor, R1 is connected in series with the Zener diode to limit the amount of current flowing through the diode and the input voltage Vin (Which must be greater than the Zener voltage) is connected across as shown in the image, and the output voltage Vout is taken across the Zener diode with Vout = Vz (Zener Voltage).
They are used as Voltage limiter and voltage regulator.
Varactor Diode is a type of diode whose internal capacitance varies with respect to the reverse voltage.
It is used in frequency modulation for FM transmitters and phase-locked loops.
It is used in frequency modulation for FM transmitters and phase-locked loops.
Tunnel diode is a type of semiconductor diode that has effectively "negative resistance" due to the quantum mechanical effect called tunneling. They areused in oscillator circuits, and in FM receivers.
PIN diode is a diode where an intrinsic layer of high resistivity is sandwiched between the P and N-region of semiconductor material. They are used in attenuators, fast switches, photodetectors
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Which of the following devices is used in voltage regulators and volta...
Explanation:
A voltage regulator is a device that maintains a constant output voltage regardless of changes in input voltage or load conditions. Similarly, a voltage limiter is a device that limits the voltage across a load. Both of these devices require a fixed reference voltage in order to regulate or limit the output voltage.
Zener Diode:
A Zener diode is a type of diode that is specifically designed to operate in the reverse breakdown region. When a Zener diode is reverse biased and the voltage across it exceeds the Zener voltage (also known as the breakdown voltage), the diode starts conducting and maintains a nearly constant voltage drop across its terminals.
Role in Voltage Regulators:
In voltage regulators, a Zener diode is used as a fixed reference voltage. It is connected in parallel with the load and maintains a constant voltage across the load. The Zener diode acts as a voltage reference, ensuring that the output voltage remains stable even when the input voltage or load conditions change.
Role in Voltage Limiters:
In voltage limiters, a Zener diode is used as a voltage clamp. It prevents the voltage across the load from exceeding a certain value (the breakdown voltage of the Zener diode). Once the voltage across the Zener diode reaches the breakdown voltage, it starts conducting and limits the voltage across the load.
Advantages of Zener Diode:
1. Zener diodes have a sharp breakdown voltage, allowing for precise voltage regulation or limiting.
2. They have a low dynamic impedance, which means that they can maintain a stable voltage even with varying load current.
3. Zener diodes are available in a wide range of breakdown voltages, making them suitable for various applications.
4. They have a fast response time, allowing them to quickly regulate or limit the voltage.
Conclusion:
In voltage regulators and voltage limiters, a Zener diode is used as a fixed reference voltage in the network. Its unique characteristics make it an ideal choice for maintaining a constant voltage and limiting voltage spikes.
A voltage regulator is a device that maintains a constant output voltage regardless of changes in input voltage or load conditions. Similarly, a voltage limiter is a device that limits the voltage across a load. Both of these devices require a fixed reference voltage in order to regulate or limit the output voltage.
Zener Diode:
A Zener diode is a type of diode that is specifically designed to operate in the reverse breakdown region. When a Zener diode is reverse biased and the voltage across it exceeds the Zener voltage (also known as the breakdown voltage), the diode starts conducting and maintains a nearly constant voltage drop across its terminals.
Role in Voltage Regulators:
In voltage regulators, a Zener diode is used as a fixed reference voltage. It is connected in parallel with the load and maintains a constant voltage across the load. The Zener diode acts as a voltage reference, ensuring that the output voltage remains stable even when the input voltage or load conditions change.
Role in Voltage Limiters:
In voltage limiters, a Zener diode is used as a voltage clamp. It prevents the voltage across the load from exceeding a certain value (the breakdown voltage of the Zener diode). Once the voltage across the Zener diode reaches the breakdown voltage, it starts conducting and limits the voltage across the load.
Advantages of Zener Diode:
1. Zener diodes have a sharp breakdown voltage, allowing for precise voltage regulation or limiting.
2. They have a low dynamic impedance, which means that they can maintain a stable voltage even with varying load current.
3. Zener diodes are available in a wide range of breakdown voltages, making them suitable for various applications.
4. They have a fast response time, allowing them to quickly regulate or limit the voltage.
Conclusion:
In voltage regulators and voltage limiters, a Zener diode is used as a fixed reference voltage in the network. Its unique characteristics make it an ideal choice for maintaining a constant voltage and limiting voltage spikes.
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Which of the following devices is used in voltage regulators and voltage limiters as a fixed reference voltage in the network?a)PIN diodeb)Varactor diodec)Zener dioded)Tunnel diodeCorrect answer is option 'C'. Can you explain this answer?
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