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Questions and Answers
What happens to the reverse current as the reverse voltage is increased in a zener diode?
What happens to the reverse current as the reverse voltage is increased in a zener diode?
What is the main purpose of a zener diode?
What is the main purpose of a zener diode?
What effect does the breakdown have on the zener impedance in a zener diode?
What effect does the breakdown have on the zener impedance in a zener diode?
What remains essentially constant at the bottom of the knee in a zener diode?
What remains essentially constant at the bottom of the knee in a zener diode?
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What is the consequence of a change in zener current in a zener diode?
What is the consequence of a change in zener current in a zener diode?
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What is a zener diode designed for?
What is a zener diode designed for?
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In a zener diode, what characteristic curve portion exhibits a certain change in VZ for a certain change in IZ?
In a zener diode, what characteristic curve portion exhibits a certain change in VZ for a certain change in IZ?
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What does Ohm's law define the ratio of?
What does Ohm's law define the ratio of?
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What happens when the zener diode is forward-biased?
What happens when the zener diode is forward-biased?
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Which semiconductor material was used in early LEDs and emits IR radiation?
Which semiconductor material was used in early LEDs and emits IR radiation?
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What determines the light output (intensity and color) of an LED?
What determines the light output (intensity and color) of an LED?
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What is IR radiation?
What is IR radiation?
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What is the direct relationship between power output translated into light and the forward current in an LED?
What is the direct relationship between power output translated into light and the forward current in an LED?
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What decreases with higher temperature in an LED?
What decreases with higher temperature in an LED?
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Study Notes
Zener Diode Characteristics
- As the reverse voltage is increased in a zener diode, the reverse current increases rapidly.
- The main purpose of a zener diode is to provide a stable reference voltage.
- When the breakdown occurs, the zener impedance in a zener diode decreases.
- The voltage at the bottom of the knee in a zener diode remains essentially constant.
- A change in zener current in a zener diode results in a corresponding change in voltage.
Zener Diode Design and Operation
- A zener diode is designed for voltage regulation and voltage reference applications.
- The knee portion of the characteristic curve exhibits a certain change in VZ (zener voltage) for a certain change in IZ (zener current).
- When a zener diode is forward-biased, it operates as a normal diode.
LEDs
- Early LEDs used gallium arsenide (GaAs) semiconductor material and emitted IR (Infrared) radiation.
- The light output (intensity and color) of an LED is determined by the semiconductor material used.
- IR radiation is a type of electromagnetic radiation with a wavelength longer than visible light.
- There is a direct relationship between power output translated into light and the forward current in an LED.
- The luminous efficiency of an LED decreases with higher temperature.
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Description
Test your knowledge about the symbol and characteristics of Zener diodes, including their operation in the reverse-breakdown region and breakdown voltages. This quiz is based on lecture 7 of Electronics, focusing on Zener diodes.
