ece-1109 ECE-1109 Introduction to ECE
Comprehensive Glossary of Key Electronic Definitions (ECE 1109)
I. Solid State Physics & Material Properties
| Term | Definition | Years of Appearance |
|---|---|---|
| Semiconductor | A special class of elements having an electrical conductivity more than an insulator and less than that of a conductor. In energy band terms, the valence band is almost filled, and the conduction band is almost empty. | 2021, 2023, 2024 |
| Insulator | Substances that do not allow electric current. In energy band terms, the valence band is filled, the conduction band is empty, and the energy gap is very large (≤15 eV). | 2018, 2019, 2021, 2024 |
| Conductor / Metal | Substances that easily allow the passage of electric current. In energy band terms, the valence band and conduction band overlap. A metal is a highly conductive solid that offers little resistance. | Foundational |
| Intrinsic Semiconductor | A pure semiconductor material that has no intentional dopant atoms added to it. Free electrons are only due to natural causes. | Foundational |
| Extrinsic Semiconductor | A semiconductor material that has been intentionally doped with specific impurities (trivalent or pentavalent elements) to modify its electrical connectivity/conducting properties. | Foundational |
| Doping | The process of adding impurity to a semiconductor to intentionally change its electrical characteristics. | Foundational |
| Donor Impurity | If a pentavalent impurity (Group V elements) is added, the fifth valence electron is loosely bound and easily excited into the conduction band. | Foundational |
| Acceptor Impurity | When a trivalent impurity (Group III elements) is added, it accepts a valence electron, leading to the creation of holes (void or absence of an electron). | Foundational |
| Electrical Neutrality (Doped Material) | A semiconductor remains electrically neutral because the charge of the ionized immobile donor or acceptor atoms balances the charge of the free carriers. | 2016, 2017, 2022 |
| Energy Band | A set of closely-spaced energy levels formed when isolated atoms are brought close together, causing individual energy levels to split. | 2018, 2019, 2021, 2023, 2024 |
| Forbidden Band / Energy Gap (Eg) | The regions separating energy bands that have no allowed energy levels. | 2018, 2019, 2021, 2023, 2024 |
| Valence Band | The band of energy occupied by the outermost electrons of an atom, which may be completely filled or partially filled. | Foundational |
| Conduction Band | The band of next higher permitted energy levels above the valence band, which is normally empty. | Foundational |
| Fermi Level (EF) | The highest energy level that an electron can occupy at absolute zero temperature (0 K). | 2021, 2023 |
| Negative Temperature Coefficient | A property of semiconductors where electrical conductivity increases (and resistance decreases) with increasing temperature. | 2016, 2018, 2020, 2021 |
| Mass Action Law | The product of the free electron concentration (n) and the free hole concentration (p) is equal to the square of the intrinsic carrier concentration (ni2). | Foundational |
| Continuity Equation | An equation describing the conservation of charge within a semiconductor. | 2021 |
| Electronics | A branch of physics that deals with the theory, study, creation, as well as application of devices and systems that utilize the flow of electrons to achieve specific functions. | 2018 |
| Solid State Electronics | The branch of electronics that utilizes solid materials, primarily semiconductors, to control the flow of electrons. | 2018 |
| Superconductors | Materials that can conduct electricity with zero electrical resistance below a certain critical temperature. | Foundational |
| Liquid Crystal | Materials that show properties between those of solids and liquids; they flow like liquids but have an ordered molecular structure. | 2019 |
| Photoluminescence | The radiation resulting from recombination when carriers are excited by photon absorption. | Surrounding Definition |
| Electroluminescence | Excited carriers resulting from the introduction of current into a sample. | Surrounding Definition |
| Cathodoluminescence | Excited carriers resulting from electron bombardment. | Surrounding Definition |
II. Diodes, Rectifiers, and Specialized Devices
| Term | Definition | Years of Appearance |
|---|---|---|
| Depletion Region | The region near the P-N junction that is depleted of free charge carriers (holes and electrons), leaving only uncovered immobile donor ions and acceptor ions. | 2015, 2016, 2018, 2019, 2020, 2021, 2022 |
| Barrier Potential (V0) / Contact Potential | The potential difference developed across the depletion region due to the separation of charge. | 2015, 2016, 2018, 2020, 2024 |
| Drift Current | Current produced due to the movement of charge carriers because of the applied electric field. | Foundational |
| Diffusion Current | Current produced due to the movement of charge carriers from a region of higher concentration to lower concentration. | Foundational |
| Ideal Diode | An ideal diode is a short in the region of conduction and an open circuit in the region of nonconduction. It can conduct in only one direction. | 2015, 2021 (via Load-Line Analysis) |
| Dynamic (AC) Resistance (rd) | Defined by a tangent line at the quiescent operating point (Q-point), calculated as rd=ΔVd/ΔId. It is often approximated as rd≈ID26 mV. | 2023, 2024 |
| DC or Static Resistance (RD) | Resistance calculated from an operating point on the characteristics: RD=VD/ID. | Foundational |
| Load-Line Analysis | A graphical method where the intersection of the linear DC load line and the non-linear device characteristic curve determines the Quiescent Point (Q-point). | 2015, 2021 |
| Reverse Recovery Time (trr) | The time required for current flow to cease when a forward-biased diode is abruptly switched to reverse bias. | 2015, 2016, 2017, 2023 |
| Transition Capacitance (CT) | Capacitance associated with the P-N junction, typically when reverse-biased. | 2019, 2021 |
| Diffusion Capacitance (CD) | Capacitance associated with the P-N junction, typically when forward-biased. | 2019 |
| Zener Diode | A diode designed to operate reliably in the reverse breakdown region. For Zener conduction, the direction of conventional flow is opposite to the arrow in the symbol. | 2015–2024 (Frequently) |
| Avalanche Breakdown | Reverse breakdown mechanism leading to current increase due to carrier multiplication (gain). | 2015, 2017, 2018, 2021, 2022, 2024 |
| Zener Breakdown | Reverse breakdown mechanism utilized by Zener diodes. | 2019, 2022, 2024 |
| Tunnel Diode | A special diode characterized by quantum mechanical tunneling, exhibiting a negative resistance region. | 2016, 2017, 2021, 2022, 2024 |
| Varactor Diode | A special diode (voltage-controlled capacitor) that utilizes transition capacitance of a reverse-biased P-N junction, used for tuning. | 2016, 2017, 2019, 2020, 2022, 2023 |
| Photo Diode | A special type of diode made with light-sensitive semiconductor material, typically operated in the reverse bias configuration. | Foundational |
| Dark Current (Photodiode) | The current that will exist with no applied illumination. | 2016 |
| PIN Diode | A special diode formed by sandwiching an intrinsic layer between P-type and N-type semiconductor to create an electric field, used for high-speed switching/RF switching. | Foundational |
| Light Emitting Diode (LED) | Diodes that emit light under forward-bias conditions. | Foundational |
| Rectifier Circuit | A circuit that performs rectification (conversion of AC voltage to pulsating DC voltage). | Foundational |
| Peak Inverse Voltage (PIV) | The maximum reverse voltage rating to which a diode is subjected, also known as PRV or VBR (breakdown voltage). | 2016, 2018, 2019, 2021, 2022 |
| Ripple Factor (R.F.) | The ratio of the RMS value of the AC component of the signal to the average value (Vdc) of the signal. | Foundational |
| Filter Circuit | A device that removes the AC components (ripple) from a rectifier output and allows the DC component to reach the load. | 2017, 2024 |
| Regulated Power Supply | A power supply designed to maintain a constant output DC voltage despite variations in the input AC line voltage or the load current. | 2015, 2016, 2017, 2018, 2021 |
| Clipper | Networks that “clip” away part of the applied signal, either to create a specific signal or to limit the voltage applied to a network. | Foundational |
| Clamper | Networks that “clamp” the input signal to a different DC level without changing the appearance or peak-to-peak swing of the applied signal. | Foundational |
III. Transistors (BJT & FET) and Amplification
| Term | Definition | Years of Appearance |
|---|---|---|
| BJT (Bipolar Junction Transistor) | A three-terminal device whose current flow is dependent on two types of carriers (bipolar), and which is classified as a current-controlled device. | 2015, 2017, 2018, 2022, 2024 |
| FET (Field Effect Transistor) | A three-terminal device whose current flow is dependent on only one type of carrier (unipolar), and which is classified as a voltage-controlled device. | 2015, 2017, 2018, 2022, 2024 |
| Alpha (α) | The ratio of collector current to emitter current (αdc=IC/IE), which relates the collector and emitter currents and is always close to one. | 2021, 2024 |
| Beta (β) | The ratio of collector current to base current (βdc=IC/IB), commonly found as hFE on specification sheets. | 2021, 2024 |
| Active Region (BJT) | The region for linear amplification where the Base-Emitter junction is forward-biased and the Collector-Base junction is reverse-biased. | Foundational |
| Cutoff Region (BJT) | The operating region where both the Base-Emitter and Collector-Base junctions are reverse-biased. | Foundational |
| Saturation Region (BJT) | The operating region where both the Base-Emitter and Collector-Base junctions are forward-biased. | Foundational |
| Pinch-off Voltage (VP) | The specific value of gate-source voltage at which the drain current (ID) is effectively zero. | 2015, 2021, 2024 |
| Gate-Source Cutoff Voltage (VGS(off)) | The specific value of VGS required to effectively pinch off the channel entirely, reducing ID to zero. | 2015, 2021, 2024 |
| Transconductance (gm) | The change in drain current (ΔID) per change in gate-source voltage (ΔVGS), calculated as gm=ΔID/ΔVGS. | Foundational |
| Depletion-Type MOSFET (D-MOSFET) | MOSFET type that has characteristics similar to a JFET and also extends into the region of opposite polarity for VGS. | 2015, 2016, 2018, 2022, 2024 |
| Enhancement-Type MOSFET (E-MOSFET) | MOSFET type that requires an applied gate-source voltage of the correct polarity to create a channel for conduction. | 2015, 2016, 2017, 2018, 2022, 2023 |
| Hybrid Parameters (h-parameters) | Parameters relating the four variables (input/output voltages and currents) in a two-port system, chosen because the mixture of variables results in a “hybrid” set of units. | Foundational |
| Hybrid Equivalent Circuit | The resulting circuit model that incorporates both a Thévenin and a Norton circuit, hence the name “hybrid”. | Foundational |
| Two-Port System | A system defined by two sets of terminals—one at the input and the other at the output. | Foundational |
| Gain–Bandwidth Product (fT) | A product relating the current gain (βmid) and the frequency (βmidfβ). | Foundational |
| Half-Power Frequencies | The frequencies at which the gain drops to 70.7% of the midband value; also called the cutoff, corner, band, or break frequencies. | Foundational |
IV. Communication & Digital Fundamentals
| Term | Definition | Years of Appearance |
|---|---|---|
| Universal Gates | Logic gates (NAND and NOR) capable of implementing any Boolean function without needing any other type of gate. | 2023, 2024 |
| Optical Fiber | A transmission medium classified according to transmission characteristics (e.g., step-index single-mode). | 2023, 2024 |
| Digital Communication System | A system involving transmission of information using digital signals, requiring components like source encoder, channel encoder, and digital modulator. | 2024 |
| Comparator | A circuit that provides an output of either maximum high or maximum low when one input goes above or below the other. | Foundational |
| Digital-to-Analog Converter (DAC) | A device that converts a digital signal into an analog signal. | Foundational |
| Analog-to-Digital Converter (ADC) | A device that converts an analog signal into a digital signal. | Foundational |
| Phase-Locked Loop (PLL) | An electronic circuit consisting of a phase detector, a low-pass filter, and a voltage-controlled oscillator (VCO). | Foundational |
| Timer IC (Astable) | An astable circuit used in timer ICs that acts as a clock. | Foundational |
| Timer IC (Monostable) | A monostable circuit used in timer ICs that acts as a one-shot or timer. | Foundational |
| Voltage-Controlled Oscillator (VCO) | An oscillator whose frequency is controlled by an input voltage. | Foundational |
| Coaxial Cable | A type of transmission media whose construction must be understood along with its transmission characteristics. | 2023 |
| Transmission Impairments (Noise/Distortion) | Factors like distortion and noise that impact the transmitted signal in communication systems. | 2023, 2024 |
| Wavelength (λ) | Related to the frequency (f) and speed of light (v) by λ=v/f. | Foundational |