Zener diode, Electrical Engineering

Zener Diode

A Zener diode is a sort of diode that allows current not only in the forward direction such as a normal diode, but as well in the reverse direction if the voltage is larger than the breakdown voltage termed as "Zener knee voltage" or "Zener voltage". The device was entitled later than Clarence Zener, who found this electrical property.

A conventional solid-state diode will not permit major current if it is reverse-biased below its reverse breakdown voltage. While the reverse bias breakdown voltage is go beyond, a conventional diode is subject to high current because of avalanche breakdown. If not this current is limited through circuitry, the diode will be permanently damaged. In case of large forward bias (current in the direction of the arrow), the diode shows a voltage drop due to its junction built-in voltage and internal resistance. The amount of the voltage drop depends upon the semiconductor material and the doping concentrations.

A Zener diode shows almost the same properties, except the device is particularly designed so as to have a very much reduced breakdown voltage, the supposed Zener voltage. By contrast with the conventional device, a reverse-biased Zener diode will show a controlled breakdown and permit the current to keep the voltage across the Zener diode at the Zener voltage. For instance, a diode with a Zener breakdown voltage of 3.2 V will show a voltage drop of 3.2 V even if reverse bias voltage applied across it is much more than its Zener voltage. Hence the Zener diode is ideal for applications such as the generation of a reference voltage (for example- for an amplifier stage), or like a voltage stabilizer for low-current applications.

Posted Date: 1/11/2013 12:31:35 AM | Location : United States







Related Discussions:- Zener diode, Assignment Help, Ask Question on Zener diode, Get Answer, Expert's Help, Zener diode Discussions

Write discussion on Zener diode
Your posts are moderated
Related Questions
Q. Why positive feedback is used in oscillator? The main application of positive feedback is in oscillators. An oscillator generates AC output signal without any input AC signa

Q. Dynamic Response of Control Systems? The existence of transients (and associated oscillations) is a characteristic of systems that possess energy-storage elements and that a

design SR latch with universal logic gates.draw and explain the logic diagrams

A single-phase, 50-kVA, 2400:240-V, 60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding R1 = 0.75 Resistance of the 240-V winding R2

Q. A practical voltage source is represented by an ideal voltage source of 30 V along with a series internal source resistance of 1.2 . Compute the smallest load resistance that c

What is the use of stepper motor? A stepper motor is a device used to get an accurate position control of rotating shafts. A stepper motor employs rotation of its shaft in term

Q. What do you mean by Waveforms? We are often interested in waveforms, which may not be constant in time of particular interest is a periodic waveform, which is a time-varying

In real life, transformers have losses which cause their behaviour to deviate from the ideal. Explain the reasons for this non-ideal behaviour

Q. Figure shows the master-slave JKFF. Assuming that the output changes on the falling edge of the clock pulse (i.e., when the clock pulse goes from high to low), discuss the opera

A former employs a servant to look after his form house. He instructs the servant to keep a watch on his goat. So that he does not harm the kitchen garden, when the entrance-door