Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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".
single phase voltage source inverter complete circuit
Q. What do you mean by Time consistent Busy Hour? (i) Busy Hour (ii) Peak Busy Hour (iv) Time consistent Busy Hour (v) Traffic intensity Ans: (i) Busy Hour: C
Q. Explain the construction of JFET? The basic construction of the p-channel JFET is shown in figure. The major part of the structure is the p-type material that forms the chan
Q. Classify Feedback control systems according to purpose of the system? • Position control systems. Here the output position, such as the shaft position on a motor, exactly fo
what is counter
Role of ERCs: A National Electricity Policy is one of the key instruments for providing policy guidance to the Electricity Regulatory Commissions in discharge of their functio
Q. What is meant by armature reaction. Explain briefly the bad effects of armature reactions. Sol. By armature reaction is meant the effect of magnetic field set up
Q. The voltage wave form of Figure is applied to an RLC series circuit with R = 2, L = 2H, and C = 1 F. Obtain i(t) in the series circuit. (Note that the capacitor and inductor va
implement 16x1 using 2x1 mux
Q. A 100-kW, 230-V, dc shunt generator, with R a = 0.05 , and R f = 57.5 has no-load rotational loss (friction, windage, and core loss) of 1.8 kW. Compute: (a) The generato
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd