This document summarizes key topics related to electronics devices and circuits, including:
1) The operation and characteristics of unbiased, forward biased, and reverse biased diodes. Forward biasing reduces the depletion region and allows current to flow, while reverse biasing increases the depletion region and prevents current.
2) Breakdown mechanisms including avalanche and Zener effects which allow current to flow under high reverse voltages.
3) Energy bands and levels that describe the quantum mechanical states of electrons in materials, and how semiconductor materials have a forbidden gap between valence and conduction bands.
4) How the barrier potential of a p-n junction decreases with increasing temperature, allowing more current to flow.
Paschen's law Is an equation that gives the breakdown voltage, that is, the voltage necessary to start a discharge or electric arc, between two electrodes in a gas as a function of pressure and gap length. It is named after Friedrich Paschen who discovered it empirically in 1889. Paschen studied the breakdown voltage of various gases between parallel metal plates as the gas pressure and gap distance was varied:
Basic of semiconductors and optical propertiesKamran Ansari
This presentation explains the band structure, intrinsic semiconductor, extrinsic semiconductor, electrical conductivity, mobility, hall effect, p-n junction diode, tunnel diode and optical properties of the semiconductor.
Paschen's law Is an equation that gives the breakdown voltage, that is, the voltage necessary to start a discharge or electric arc, between two electrodes in a gas as a function of pressure and gap length. It is named after Friedrich Paschen who discovered it empirically in 1889. Paschen studied the breakdown voltage of various gases between parallel metal plates as the gas pressure and gap distance was varied:
Basic of semiconductors and optical propertiesKamran Ansari
This presentation explains the band structure, intrinsic semiconductor, extrinsic semiconductor, electrical conductivity, mobility, hall effect, p-n junction diode, tunnel diode and optical properties of the semiconductor.
FURTHER RESULTS ON THE DIRAC DELTA APPROXIMATION AND THE MOMENT GENERATING FU...IJCNC
In this article, we employ two distinct methods to derive simple closed-form approximations for the
statistical expectations of the positive integer powers of Gaussian probability integral Eg [Qp ( bWg )]
with
respect to its fading signal-to-noise ratio (SNR) g random variable. In the first approach, we utilize the
shifting property of Dirac delta function on three tight bounds/approximations for Q(.) to circumvent the
need for integration.
The Zener diode is a heavily doped diode which, as a result of doping, has a very narrow depletion region. This allows the diode to be operated in the reverse biased region of the characteristic curve without damaging the PN junction.
“Zener Effect”: The area of Zener diode operation (<5V) where the Diode maintains a constant voltage output while operating reverse biased.
“Avalanche Effect”: >5V applied to the diode while reverse biased which tends to cause the diode to eventually breakdown due to heat generation within the lattice structure of the crystal.
Because of its higher temperature and current capability, silicon is usually preferred in manufacture of Zener Diodes
Zener Diodes provide a stable reference voltage for use in power supplies, voltmeter & other instruments, voltage regulators.
Electrical current, voltage, resistance, capacitance, and inductance are a few of the basic elements of electronics and radio. Apart from current, voltage, resistance, capacitance, and inductance, there are many other interesting elements to electronic technology. ... Use Electronics Notes to learn electronics online.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
1. SUB : ELECTRONICS DEVICES & CIRCUITS (2131006)
Topics :
The Unbiased Diode, Forward Bias, Reverse Bias, Breakdown, Energy Levels, The energy
Hill, The Barrier Potential and Temperature , Reverse-Biased Diode
Created by:
Meghwal Dinesh S. 130140111041
Mistry Keyur R. 130140111043
Nakrani Pratik R. 130140111046
2. The Unbiased Diode
What is Diode :- A semiconductor device with two
terminals, typically allowing the flow of
current in one direction only.
What is Unbiased Diode :- when we do not apply any
source of energy or electricity than a
diode is said to be unbiased diode.
3. The Unbiased Diode
FORMATION OF P-N JUNCTION
p type
semiconductor
n type
semiconductor
Anode
Cathode
Junction
P side is called as N type is called as
Holes
Electrones
Majority
Minority
Minority
Majority
Diffusion is same
4. Forward bias
If p region is connected to the positive terminal of external dc source & n region is
connected to negative terminal of dc source is said to be forward biasing.
If If
Forward biasing of a diode Symbolic Representation
5. Operation of a Forward biased Diode
-
-
-
-
-
+
+
+
+
+
+
+
-
-
The holes Converting into
the negative ions into
neutral atomes
p n
R
Current
limiting
resister
V
Due to negative terminal of external
souce connected to n-region so
electrons are pushed towards p-side
Due to Positive terminal of external souce
connected to p-region so holes are
pushed towards n-side
The Electrones Converting
into the Positive ions into
neutral atomes Due to this The
width of deplation
region will reduce
Due to reduction in
the depletion region
width the barrier also
reduced.
Hence a large number
of electrons & holes can
cross the junction under
the influence of
externally connected
DC voltage
As we can say that the flow of electrons is current so that the current produce
in this position said to be forward Current
6. Reverse bias
If p region is connected to the negative terminal of external dc source & n region is
connected to Positive terminal of dc source is said to be reverse biasing.
Ir Ir
Reverse biasing of a diode Symbolic Representation
7. Operation of a Reverse biased Diode
-
-
-
-
-
+
+
+
+
+
The process of widening is not take place at longer time due to
there is no steady flow of current from n-side to p-side
+
+
-
-
p n
R Current
limiting
resister
Holes in P region are attracted V
towards negative terminal of
supply
Electrones in n region are
attracted towards positive
terminal of supply.
Due to this The width
of deplation region will
incresases
Due to increases
in the depletion region
width the barrier also
increases.
Minority carrier in p-region
attracted
towards positive of
supply.
-
-
-
-
-
+
+
+
+
+
So that few electrons are flow so the current is also tiny that current states at this position
said to be reverse saturation current due to minority carrier
8. Breakdown
The reverse saturation current flowing in reverse biased diode is
dependent only on temperature &
independent on reverse applied voltage externally.
The breakdown in reverse biased diode can take place due to following effects.
Avalache
effect
Zener
effect
B
R
E
A
K
D
O
W
N
9. Breakdown due to Avalache effect
Due to large voltage
velocity of minority
carriers will increase
to great exent
Therefore Kinetic
energy also increses
While traveling
minority carriers will
collide with stable
atomes & import
some of kinetic
energy To the
valance electrons
present in co-valent
band
Due to this
additional energy
these electones will
break the covalent
bonds &jump into
the conduction
band to free for
conduction.
Now this free
electones will be
accelerated &they
knockout some
more valance
electrons by means
collisions.
THIS “CHAIN
REACTION” IS
CALLED as
“AVALANCHE
EFFECT”
10. Break down due to Zener effect
Due to heavy doping of
p & n side of the diode
the deplation region is
narrow in reverse biased
condition.
Therefore electrical field
which is the voltage per
unit distance is very
intense across the
deplation region
This intense electric field
can pull some of
valence electrons by
breaking the covalent
bonds these electrons
than become free
electrons.
The large number of
such electrons can
constitute through
diode this is called as
the breakdown due to
zener effect
11. Energy Levals
Each electrons orbit has an energy leval associated with it. The electrons in the inner orbits are
more closely bound to the nucleus to the nucleus and posses less energy.
As we move towards the valance shell, the bliding force between nucleus & electrons reduces
and the electrons reduces & elctrones posses higher energy.
Shell 1
Lowest energy
Energy leval increses as we move
away from the nucleus
Valance orbit has
highest energy leval
12. Energy Bands
First band
Formed by cluster
of energy leval in
first shell
Valence
band
Corresponds to
valance electrons
present in different
atomes of
materials
Enrgy associated is
second highest.
Conduction
band
The electrons in
conduction band
are the free
electrons.
Enrgy associated is
highest.
Concept of forbidden gap:
• Forbidden gap is energy gap that separates the conduction band & Valence bands.
• For any material the forbidden gap may be large, small , or even nonexistent. The materials
are classified as conductor , insulator, semiconductors based on relative widths of forbidden
gap.
13.
Energy Hill
Energy
Conduction band
Valence band
The Valence &
Conduction bands
are slightly lower
energy levals
This is Due to difference
in the atomic
characteristics of the
pentavalent(n-type) &
Trivalent(p-tpye) impurity
atomes
Minority
carriers(electrons)
Majority
carriers(Holes)
Majority
carriers(electrons)
Minority
carriers(Holes)
A p-region n-region K
14. Barrier Potential & Temperature
Inernal temperature of p-n junction is known as the junction temperature
Whereas the air surrounding the device is called as ambient temprerature
For conducting
Diode
Junction Temp. > Ambient Temp.
Barrier Potential 1
junction temperature
So that Due to Incresed Temp. barrier potential decreases more electrons & hole
pair produced . These will diffuse into deplation region to narrow it down.
The barrier potential of a silicon diode decreases at 2 mV per degree Celsius rise in
junction temperature.
-2mV/◦ 퐶 =
Δ퐕
Δ퐓