Introduction to Electronics and design

Introduction to Electronics and design

INTRODUCTION TO ELECTRONIC CIRCUITS AND DEVICES Presenter : Engr. Cezar N. Velasco Jr. Learning Outcomes Describe the historical development of electronics Describe the design process of electronic

circuits and systems Describe electronic systems and their classifications Introduction Radios Televisions Audio equipments Computers Industrial Control and Automation The field of electronics deals with the design and applications of electronic devices History of Electronics

Integrated Circuits (ICs) 1958 1956 1947 Transistor 1925 Field Effect device

1906 1904 Triode vacuum tube Solid-state point contact diode Thyristor FM radio,

Radar First radio circuits: Superheterod yne receiver, Television Power Electroni cs Color Television Unipolar field effect

transistor Moores Law Diagram Growth in number of Transistors Levels of Integration Date Degree of Integration Number of Components 1950s

Discrete Components 1 to 2 1960s Small-scale Integration (SSI) Fewer than 102 1966 Medium-scale Integration (MSI) From 102 to 103

1969 Large-scale Integration From 103 to 104 1975 Very-large-scale Integration From 104 to 109 1990s Ultra-large-scale Integration

More than 109 The degree of device integration continues to follow Moores Law, which is an observation made by Gordon E. Moore that the number of Transistors inside an IC could be doubled every 24 Electronic System An electronic system is an arrangement of electronic devices and components with a defined set of inputs and outputs. Electronic system may be categorized/classified according to the type of application such as

communication system, medical electronics, instrumentation, control system, computer system, mechatronics, office electronics, consumer electronics, automobile electronics Example of Electronic System Antenna Speaker Electroni c system Radio receiver Temperatur

e sensor Electroni c system Display Temperature display instrument Electronic systems often use sensors and actuators. Sensors and actuators are often called transducers. A loudspeaker is an example of a transducer. Types of Sensor

Thermistors and thermocouples to measure temperature Photransistors and photodiodes to measure light Strain gauges and piezoelectric materials to measure force Potentiometers, inductive sensors, and absolute position encoders to measure displacement Microphones to measure sound Tachogenerators, accelerometers, and Doppler

effect sensors to measure motion Anemometer to measure the wind speed Types of Actuators Resistive heaters to produce heat Light-emitting diodes (LEDs) and light dimmers to control the amount of light Solenoids to produce force Meters to indicate displacement

Electric motors to produce motion or speed Speakers and ultrasonic transducers to produce sound. The field of electronics can be classified into three areas: Analog electronics deals primarily with the operation and applications of transistors as amplifying devices

Digital electronics deals primarily with the operation and applications of transistors as on and off switching devices. Power electronics deals with the operation and applications of power semiconductor devices, including power transistors, as on and off for the control and conversion of electric power. Advantages and disadvantages of Analog and Digital electronics

Noise is usually present in electronic circuits, added directly to analog signals and hence affect the signals. Noise will not affect the digital output and can effectively removed be removed from digital signals. An analog circuit requires fewer individual components than a digital circuit to perform a given function. However, an analog circuit often requires large capacitors or inductors that cannot be manufactured in ICs. A digital circuit tends to be easier to implement than an analog circuit in ICs, although it can be more complex than an analog circuit. Digital circuits, however, generally offer much higher

Advantages and disadvantages of Analog and Digital electronics Analog systems are designed to perform specific functions or operations, whereas digital systems are adaptable to a variety of tasks or uses. Signals from sensors and actuators in electronic systems are generally analog. If an input signal has a low magnitude and must be processed at very high frequencies, then analog technique is required. For optimal performance and design, both

analog and digital approaches are often used. Analog-to-Digital Converters An A/D converter converts an analog signal to digital form and provides an interface between analog and digital signals Digital-to-Analog Converters A D/A converter takes an input signal in binary form and produces an output voltage or current in an analog (or continuous) form. Notation Definition

Quantity Subscript Example DC value of the signal Uppercas e Uppercas e VD

AC value of the signal Lowercas e Lowercas e vd Total instantaneous value of the signal (DC and AC) Lowercas

e Uppercas e vD Complex variable, phasor, or rms value of the signal Uppercas e Lowercas e

Vd Example A vab iA 2sinw t vAB VDC vAB VDC

vab 0 B VDC and IDC are DC values vab and ia are the instantaneous AC values vAB and iA are total instantaneous values Vab and Ia are total rms values t Specifications of Electronic Systems An electronic system is normally designed to

perform certain functions or operations. The performance of an electronic system is specified or evaluated in terms of voltage , current, impedance, power, time, and frequency at the input and output of the system Transient Specifications Transient Specifications refer to the output signal of a circuit generated in response to a specified input signal, usually a repetitive pulse signal Cont.Transient Specifications Delay time td is the time before the circuit can respond to

any input signal. Rise time tr is the time required for the output to rise from 10% to 90% of its final (high) value. On time ton is the time during which the circuit is fully turned on and is functioning in its normal mode. Fall time tf is the time required for the output to decrease from 90% to 10% of its initial (high) value. Off time toff is the time during which the circuit is completely off, not operating. Distortion Distortion may take many forms and can alter the shape, amplitude, frequency, or phase of a signal Frequency Specifications

The range of signal frequencies of electronic signals varies widely, depending on the applications. For frequencies less than f L and greater than fH, the output is attenuated. But for the frequencies between fL and fH, the output remains almost constant. The frequency range from fL to fH is called bandwidth of the circuit ContFrequency Specifications DC and small-signal Specifications The DC and small-signal specifications include the DC power supply VCC , DC biasing currents (required to activate and operate internal transistor), and power

dissipation PD (power requirement from the DC power supply). Signal Amplification Types are classified by the types of input and output signals Voltage Amplifier produces an amplified output voltage in response to an input voltage signal Transconductance amplifier produces an

amplified output current in response to an input voltage signal Current Amplifier produces an amplified output current in response to an input current signal Impedance amplifier produces an amplified output voltage and delivers power to a low resistance load signal Power amplifier produces amplified output voltage and deliver power to a low resistance load in response to an input voltage signal Functional types are classified by their function or output characteristics

Linear amplifier produces an output signal in response to an input signal without introducing significant distortion on the output signal, whereas a nonlinear amplifier does introduce distortion. Audio amplifier is a power amplifier in the audio frequency (AF) range. Operational amplifier performs some mathematical functions for instruments and for signal processing. Wideband amplifier amplifies an input signal over a wide range of frequencies to boost signal levels,

whereas a narrowband amplifier amplifies a signal over a specific narrow range of frequencies. Radio frequency (RF) amplifier amplifies a signal for use over the RF range. Servo amplifier uses a feedback loop to control the output at the desired level. Interstage coupling types are classified by the coupling method of the signal at the input, at the output, or between stages

RC-coupled amplifier uses a network of resistors and capacitors to connect it to the following and preceding amplifier stages. LC-coupled amplifier uses a network of inductors and capacitors to connect it to the following and preceding amplifier stages. Transformer-coupled amplifier uses transformer to match impedances to the load side and input side. Direct-coupled amplifier uses no interstage elements, and each stage is connected directly to the following and preceding amplifier stages. Frequency types are classified in accordance to the frequency range DC amplifier is capable of amplifying signals

from zero frequency (DC) and above. AF amplifier is capable of amplifying signals from 20 Hz to 20 kHz. Video amplifier is capable of amplying signals up to a few hundred megahertz (< 10 MHz for TV). Ultra-high frequency (UHF) amplifier is capable of amplifying signals up to a few gigahertz. Load types are classified in accordance to the type of load Audio amplifier has an audio type of load Video amplifier has a video type of load Tuned amplifier amplifies a single RF or band of frequencies.

Engineering Design Engineering design is the process of devising a system, component, or process to meet desired needs. It is a decision making process (often iterative), in which the basic sciences and mathematics and engineering sciences are applied to convert resources optimally to meet these stated needs. Source: From the definition of ABET (Accreditation Board for Engineering and Technology)

Analysis is the process of finding the unique specifications or properties of a given circuit. Design is the creative process of developing a solution to a problem. Elements of Design Process Circuit-level Design Process End of first Topic

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