Electronics Glossary – Q
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|Q factor – (1) Quality factor: the ratio of energy stored to energy dissipated. A measure of the relative losses in an inductor. It is also known as the quality factor, defined as the ratio of inductive reactance to effective resistance. Q is zero at the SRF of an inductor. (2) Also the symbol for electrical charge. (3) An omnipotent being in the Star Trek universe.
|Ratio of energy stored to energy dissipated. A measure of the relative losses in an inductor. It is also known as the quality factor, defined as the ratio of inductive reactance to effective resistance. Q is zero at the SRF of an inductor.
|Quadrature Amplitude Modulation. A two-dimensional modulation used for ADSL, cable modems and proposed for VDSL. CAP is a special case of QAM. In QAM, a single carrier frequency is modulated in both sine and cosine components.
|Quadrature phase shift key modulation.
|Systematic, planned, and documented activities designed to provide confidence that a product will meet specifications.
|Activities that monitor, measure, and control the characteristics of a material, component, or product to documented specifications.
|An analog-to-digital converter. A device that measures the magnitude of a time varying quantity in multiples of some fixed unit or quantum, at a specified instant or specified repetition rate, and delivers a proportional response that is usually in pulse code or digital form. The amplitude of the response signal is at each instant proportional to the number of quanta measured.
|In a photodiode, the ratio of primary carriers (electron-hole pairs) created to incident photons. A quantum efficiency of 70% means 7 out of 10 incident photons create a carrier.
|Waiting lines resulting from temporary delays in providing service.
|A type of connector shell that permits rapid locking and unlocking of two connector halves.
|quiescent operating point
|The dc voltages, currents, and dissipation associated with a circuit while it is not being subjected to an input signal.
|QUad In-line Package. A packaging technique similar to a DIP but having two rows of pins along each long side, or a total of four rows.