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
Design a low noise amplifier using an Infineon RF transistor BFP640. The amplifier is to be used to amplify the L2 GPS signal and so the centre frequency is 1227MHz and bandwidth 4

Q. (a) What is the difference between a TEM mode and a TE mode? (b) Explain the terms "cutoff wavelength" and "dominant mode" as applied to waveguides. Find the cutoff wavelengt

I want proof of shockley diode equation with all steps

Q. A 10-kW, 230-V shunt generator, with an armature-circuit resistance of 0.1  and a field- circuit resistance of 230 , delivers full load at rated voltage and 1000 r/min. If the

State the features of Washing machines Microprocessor would be used to control the below features, for instance: - Water temperature -  Time for every cycle -  Wash cy

Connect the TTL output (square wave) of the "Audio Oscillator" to the "Scope Selector". Adjust the frequency of the square wave to 2 kHz. Observe and record the time domain pict

report on diode

At the completion of this unit, you will be able to determine the cutoff frequencies and attenuations of RC and RL low- and high-pass filters by using test circuits. UNIT FUNDA

Q. What do you mean by Digital Building Blocks? Whereas a continuous change from one value to another is the essential characteristic of an analog signal and continuous-state (

Application of Microprocessors Microprocessor microcontroller based systems  may be used  in almost  every filed of life  and  their  applications  are increasing day by day