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VLSI Definitions
           Definitions of the terms that are often used in Chip design world. Please help us to improve the list. You can add VLSI terms and its definitions with out registering in the site.

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There are 257 entries in the glossary.
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Term Definition
Path delayThe time required for a signal to traverse through a wire between two circuit components.
 
Photo-maskThe photographic film (glass plate) which contains the masking pattern required for a particular wafer processing step (see Mask).
 
PhotonicsThe science and technology of generating, manipulating, transmitting, and detecting light. It is a field that encompasses optics, quantum optics, lasers, optoelectronics, imaging, optical information processing, materials science, and their applications.
 
PICIntegrated circuits that include active and passive photonic devices on the same chip.
 
Plasma Vapor DepositionA SEMICON process used to deposit material onto a wafer by ionizing a gas plasma (typically via microwave radiation). In PVD chemical reactions occur in the gas/plasma phase, as opposed to on the surface of the wafer in CVD.
 
pMOSA p-channel metal-oxide semiconductor transistor is one in which p-type dopants are used in the gate region. A negative voltage on the gate turns the device on.
 
Printed Circuit BoardAn layer of nonconducting material sandwiched between layers of copper interconnecting patterns onto which are soldered integrated circuit packages and other electronic components.
 
Process stabilityThe degree to which a process undergoes change to achieve acceptable yield.
 
Proof-of-design partA fabricated ASIC used to verify ASIC functionality before fabricating engineering and flight parts.
 
PrototypingThe implementation of a microsystem, component, or system to verify functionality or show proof-of-concept.
 
PSKPhase-shift keying is a modulation technique in which the phase of the carrier conveys the input signal\'s information.
 
QA (Quality Assurance)The practice of checking hardware, software, or systems for defects, identifying such defects, and then checking to make sure that such defects are corrected when future revisions of software or hardware are ready for testing.
 
QPSKQuadrature Phase Shift Keying is a form of Phase Shift Keying in which two bits are modulated at once, selecting one of four possible carrier phase shifts i:e 0, 90, 180, or 270 degrees.
 
Quality factorA measure of the sharpness of resonance of an electronic / electromechanical resonator component. A device with a High Q factor has a sharp, large magnitude, well defined resonance. It is defined as the ratio of the reactance to the effective series resistance of a component.
 
Quantum devicesemiconductor device which operation is based on quantum effects.
 
Quantum wellsemiconductor heterostructure fabricated to implement quantum effects in electronic and photonic applications; typically an ultra-thin layer of narrower bandgap semiconductor is sandwiched between two layers of larger bandgap semiconductor.
 
Quasi stableA flip-flop has two well-defined stable conditions, \'1\' and \'0\'. When there is a violation in setup or hold time of Flip-Flop, it enters into a state called ‘metastable’ or ‘quasi stable’ state, where the output of Flip-Flop is unpredictable. This is so called metastability.
 
QueueA data construct that is first-in, first-out (FIFO).
 
Register transfer levelA circuit modeling level based on the flow of data from register to register.
 
ResistorA nozzle that restricts flow of electricity giving control over the current at any poiint. Ex: volume control dial on a TV..adjusting volume adjusts a resistor which reduces flow of current to the speaker to decrease the noise level.
 
RTOSA specialized operating system that guarantees performance levels for time-critical applications.
 
Scan pathOne or more serial shift register chains through which test signals are applied and test results are observed. The scan path registers may also be used in the normal mode of the circuit for status registers, data storage, etc.
 
Schematic captureThe act of entering a circuit schematic into a graphical CAD tool.
 
SemiconductorA material that is neither a good conductor of electricity (like copper) nor a good insulator (like rubber). The most common semiconductor materials are silicon and germanium. Computer chips, both for CPU and memory, are composed of semiconductor materials. Semiconductors make it possible to miniaturize electronic components, such as transistors. Not only does miniaturization mean that the components take up less space, it also means that they are faster and require less energy.
 
semiconductor deviceessentially any homogenous or multilayer piece of semiconductor material which is processed in such way that it can perform in the or photonic (e.g. LED, laser) function.
 
semiconductor laserLight emitting semiconductor device which in contrast to simple light emitting diode (LED) generates very sharp emission lines and allows modulation bandwidth in a gigahertz range.
 
Serial InterfaceA serial interface is one in which data is sent in a single stream of bits, usually on a single wire-plus-ground, wire-pair, or single wireless channel.
 
Silicon on InsulatorA type of fabrication process where silicon is deposited on an insulating substrate. The process layers from top to bottom are: Semiconductor, insulator.
 
SimulationThe use of a CAD tool that mimics the behaviour of the actual circuit through a collection of sub-circuit models enabling designers to test, verify, and debug circuits before layout and fabrication.
 
SlicingTerm refers to the process of cutting of the single-crystal semiconductor into wafers; high precision diamond blades are used.
 


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Glossary & Definitions

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