Basic Electronics Solid State Pdf Free Download
Shanae Maerz
COURSE GOALS: The course is an introduction to semiconductor fundamentals and applications to the electronic devices. Course creates the background in the physics of the compound semiconductor-based electronic devices and also prepare students to advanced courses in solid state and quantum electronics. The course provides an opportunity for students to continue education in undertaking advanced study and research in the variety of different branches of semiconductor device applications. Topics include the background solid state and semiconductor physics, and basic principles of electronic devices operation.
Electronics is about transforming information into electrical signals and using the high-speed processing capabilities of electronics to perform tasks reliably, repeatedly, and fast. Electronic components and printed circuit boards form the basic parts of an electronic system.
While electronic components process information in form of electrical signals, a printed circuit board is the skeletal structure on which the electronic components are mounted and soldered to hold them together and provide pathways for information to flow between components through PCB traces.
PCB traces are metal wires connected between components. These traces are usually copper strips and sometimes aluminum or silver. The material, on which the components and traces are placed, is made of insulator material (dielectric), typically fiberglass impregnated with resin. This dielectric material can be of various kinds depending on the application of the circuit board.
This article gives an overview of the different types of electronic components. It focuses on the parameters to be considered while selecting an electronic component and gives details about standard sizes and shapes of components. These are essential while designing and manufacturing an electronic product. To learn about failures, read common errors encountered in discrete components.
Some of the most commonly used electronic components are resistors, capacitors, inductors, diodes, LEDs, transistors, crystals and oscillators, electromechanical components like relays and switches, ICs, and connectors. These components have leads/terminals and are available in specific standardized packages, that the designer can choose to suit his application. SMT (surface mount technology) and through-hole are the two types of mounting techniques used to place components on a PCB.
The resistor is a passive electrical component whose function is to introduce resistance to the flow of electric current in an electrical circuit to limit the current. The magnitude of the opposition to the flow of current is called the resistance of the resistor. A larger resistance value indicates a greater opposition to current flow. The resistance is measured in ohms (Ω), and its equation is as follows.
The Capacitor is a passive electrical component, whose function is to store electrical energy and deliver it to the circuit when needed. The capacity of a capacitor to store electrical charge is known as the capacitance of that capacitor. It is denoted by (C). The unit of capacitance is Farad (F) and can range from, micro Farad (F) 1x 10-6 F, Kilo pico Farad (KpF), or nano Farad (nF) 1x 10-9 F to pico Farad (pF) 1x 10-12 F. Typical values range from 1pF to 1000uF.
Therefore, if the voltage across a capacitor is constant, there will be no current flow through the capacitor; and current will only flow across the capacitor if the voltage across it changing with time for example an AC voltage. That is why a capacitor blocks DC signals and allows only AC signals to pass through it when used in the series of the path of the signal.
When the time-varying current flows through an inductor, the magnetic field is created which induces an electromotive force (e.m.f.) (voltage) in the inductor. Voltage V, across an inductor of inductance L, is given by:
An ideal inductor has zero resistance and zero capacitance. However, real inductors have a small value resistance associated with the winding of the coil and whenever current flows through it, energy is lost in the form of heat.
Inductors are mainly classified depending on the core material used and operating frequency. The following are the different types of inductors and available in through-hole as well as SMD package based on the construction.
The quartz crystal is made from a thin piece of quartz wafer. This wafer is made from silicon material. The wafer is tightly fitted and controlled between two parallel metalized surfaces which make an electrical connection. When an external voltage is applied to the plates, the crystal vibrates with a certain fundamental frequency which creates alternating waveform which swings between high and low levels. This phenomenon is known as the piezoelectric effect. Due to this property, they are used in electronic circuits along with active components to create stable clock input to the processor.
A relay is an electromagnetic switch that opens and closes potential-free contacts. An electromechanical relay consists of an armature, coil, spring, and contacts. When the voltage is applied to a coil, it generates a magnetic field. This attracts the armature and causes a change in the open/closed state of the circuit. It is mainly used to control a high-powered circuit using a low power signal.
The basic electronic components that depend on an external power source for their operation are called active components. They can amplify signals and/or process signals. Some of the active components are transistor, integrated circuits ICs.
The MOSFET (metal oxide semiconductor field-effect transistor) transistor is a semiconductor device that is different than bipolar junction transistor in terms of construction though the applications remain the same as switching and amplifying. It has four terminals such as drain, gate, source, and body. The body is shorted with a source terminal. The gate is insulated from the channel near an extremely thin layer of metal oxide. Due to which it offers very high resistance compared to BJT.
By controlling the gate voltage (VGS +ve/-ve) width of a channel along which charge carriers flow (electrons or holes) from source to drain can be controlled. The P-Channel MOSFET has a P-Channel region between the source and drain and for N-channel MOSFET has an N-channel region.
An integrated circuit (IC) is an electronic circuit built on a semiconductor wafer, usually made of silicon. On this wafer, there are millions of miniaturized transistors, resistors, and capacitors, which are connected by metal traces. The ICs are powered by an external power supply for their operations. ICs perform specific functions such as data processing and signal processing. The entire physical size of the IC wafer is extremely small compared to that of discrete circuits hence it is called a microchip or simply chips. Because of their small size, ICs have low power consumption.
A microprocessor/microcontroller is an integrated circuit, which can process the digital data. For example, temperature sensor data can be read by a microprocessor and using its internal logic to perform control functions such as switching an air-conditioner ON or OFF. The ability to program a microprocessor gives it the flexibility to be used in a wide range of applications. Some of the applications are consumer electronics (microwave, washing machine, TV), industrial applications (motor control, process control), communication applications (wireless communication, telephony, satellite communication).
A microprocessor is a complex IC having an inbuilt central processing unit (CPU) consisting of an arithmetic logic unit (ALU), registers, buffer memory, clock. The processor does not have inbuilt memory and needs to interface RAM and ROM externally. Applications: computers, laptops, servers, basically for high-end processing.
The component sizes of the selected SMT components are important while manufacturing the electronic product. The assembler should have the capability to assemble the small size components on the PCBs. The passive components such as resistors, capacitors, and inductors which have two leads are found in standard sizes as shown in the table below. The SMT component sizes are given in inches as well as metric systems. The most common sizes are in inches such as 0402, 0603,0805 1210, etc.
Electronic component distributors are a key resource for supply chain management. They are a single-window source of components from where a designer can buy components directly rather than buying from an individual manufacturer. Distributors stock components from different manufacturers and provide a simple and efficient web portal interface for selecting and purchasing components.
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Solid-state electronics means semiconductor electronics; electronic equipment using semiconductor devices such as semiconductor diodes, transistors, and integrated circuits (ICs). The term is also used for devices in which semiconductor electronics which have no moving parts replace devices with moving parts, such as the solid-state relay in which transistor switches are used in place of a moving-arm electromechanical relay, or the solid-state drive (SSD) a type of semiconductor memory used in computers to replace hard disk drives, which store data on a rotating disk.
The term "solid state" became popular in the beginning of the semiconductor era in the 1960s to distinguish this new technology based on the transistor, in which the electronic action of devices occurred in a solid state, from previous electronic equipment that used vacuum tubes, in which the electronic action occurred in a gaseous state.
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