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The Q factor is a parameter that describes the resonance behavior of an underdamped harmonic oscillator (resonator). Sinusoidally driven resonators having higher Q factors resonate with greater amplitudes (at the resonant frequency) but have a smaller range of frequencies around that frequency for which they resonate; the range of frequencies for which the oscillator resonates is called the ...
The quality of the resonance (how long it will ring when excited) is determined by its Q factor, which is a function of resistance: =. An idealized, lossless LC circuit has infinite Q , but all actual circuits have some resistance and finite Q , and are usually approximated more realistically by an RLC circuit .
In electronics, a Q multiplier is a circuit added to a radio receiver to improve its selectivity and sensitivity. It is a regenerative amplifier adjusted to provide positive feedback within the receiver. This has the effect of narrowing the receiver's bandwidth, as if the Q factor of its tuned circuits had been
In electrical engineering and telecommunications the Chu–Harrington limit or Chu limit sets a lower limit on the Q factor for a small radio antenna. [1] The theorem was developed in several papers between 1948 and 1960 by Lan Jen Chu, [2] Harold Wheeler, [3] and later by Roger F. Harrington. [4]
Journal of Computational Electronics is a peer-reviewed scientific journal published bimonthly by Springer Science+Business Media. It covers research on the applications of numerical and computational methods on electronics engineering problems, including those related to device simulation in photonics , VLSI , MEMS and microwave engineering .
The ultra-low electrical resistivity of a superconducting material allows an RF resonator to obtain an extremely high quality factor, Q. For example, it is commonplace for a 1.3 GHz niobium SRF resonant cavity at 1.8 kelvins to obtain a quality factor of Q=5×10 10. Such a very high Q resonator stores energy with very low loss and narrow bandwidth.
Q-meter E9-4. Internally, a minimal Q meter consists of a tuneable RF generator with a very low (pass) impedance output and a detector with a very high impedance input. There is usually provision to add a calibrated amount of high Q capacitance across the component under test to allow inductors to be measured in isolation.
The Q factor is an important part of AC (RLC) circuits, which is a topic studied in undergraduate Electricity & Magnetism [citation needed]. Resukalt 03:44, 9 November 2023 (UTC) Support: The harmonic oscillator is one of the most important basic concepts in physics. Every undergrad physics major is familiar with the Q factor of an oscillator ...