Operation of zener diode, Electrical Engineering

Assignment Help:

Operation of Zener Diode

The Zener diode's operation depends upon the heavy doping of its p-n junction permitting electrons to tunnel from the valence band of the p-type material to the conduction band of the n-type material. Within the atomic scale, this tunneling corresponds to the transport of valence band electrons into the empty conduction band states; as a effect of the reduced barrier among these bands and high electric fields that are induced because of the comparatively high levels of dopings on both of the sides. The breakdown voltage could be controlled fairly accurately in the doping process. When tolerances within 0.05% (per cent) are available, the most extensively employed tolerances are 5% (per cent) and 10% (per cent). Breakdown voltage for generally available zener diodes can change widely from 1.2 volts to 200 volts.

Other mechanism which produces a similar effect is the avalanche effect like in the avalanche diode. The two sorts of diode are in fact constructed similar way and both effects are exist in diodes of this type. In silicon diodes up to approximately 5.6 volts, Zener effect is the predominant effect and depicts a marked negative temperature coefficient. Above 5.6 volts, the avalanche effect turns into predominant and shows a positive temperature coefficient. In a 5.6 V diode, the two effects take place together and their temperature coefficients neatly cancel each other out, so the 5.6 V diode is the component of choice in temperature-critical applications. Current manufacturing techniques have generated devices with voltages lower than 5.6 V with negligible temperature coefficients, but since higher voltage devices are encountered, the temperature coefficient increases radically. A 75 V diode has 10 times the coefficient of a 12 V diode. All such types of diodes, regardless of breakdown voltage, are generally marketed under the umbrella term of "Zener diode".


Related Discussions:- Operation of zener diode

Dc machine closed-loop dynamics, i) Calculate the eigenvalues of a 100 hp,...

i) Calculate the eigenvalues of a 100 hp, 1150 rpm dc machine at rated flux with no extra load inertia. Use the "hot" value of the armature resistance. Calculate estimates of t

Describe operation performed by instruction OUT47 h, Describe the operation...

Describe the operation performed by the instruction OUT 47 h, AL. This transfers the content of AL to I/O port 47h. See that I/O port number shows as 0047h on the 16 bit addres

Zener breakdown voltage, (a) For the Zener diode series voltage regulator s...

(a) For the Zener diode series voltage regulator shown in the Figure. calculate V L , I Z , V R and P Z for R L = 1.2 KΩ and repeat it for R L = 3 KΩ ? Consider Zener breakdow

Engineering Science, A rifle with a mass of 3,5 kg fires a bullei with a ma...

A rifle with a mass of 3,5 kg fires a bullei with a mass of 120 g with a muzzle velocity of 420 mls. Calculate the following: 1.4.''l The momentum before the rifle was fired ''1.4.

Cmos integrated circuit design, design using softwares (LEdit7, LTspice) t...

design using softwares (LEdit7, LTspice) the project has many aspects and I would like you to check them on the website with my personal password. in the project specifications (d

Mobile and wirelss communicatio, In a CDMA system, the signal is spr...

In a CDMA system, the signal is spread over a large bandwidth by multiplying the transmitted symbol by a sequence of short pulses, also called chips. The

Identify the processes involved in fabrication, The first three elements of...

The first three elements of the task are: 1. To critically examine a selection of the components used on this design 2. To recommend materials to be used in making the board

Evaluate the quiescent point of the circuit, Question: a). For the circ...

Question: a). For the circuit shown in figure state which operation is performed and draw the output waveform if measured between points A and B. The input signal is given in f

Cro, Diagram and explanation of cro

Diagram and explanation of cro

Obtain rated fundamental voltage across the motor, A 440-V, 60-Hz, six-pole...

A 440-V, 60-Hz, six-pole, wye-connected, squirrel-cage induction motor with a full-load speed of 1170 r/min has the following parameters per phase referred to the stator: R 1 = 0.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd