Relationship between factor and bandwidth smsenabled

Q factor - Wikipedia

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The upper and lower band edges read from the curve are Hz for fl and Hz for fh. Figure below Below the resonant frequency, the parallel resonant circuit looks inductive since the impedance of the inductor is lower, drawing the larger proportion of current.

Q Factor and Bandwidth of a Resonant Circuit | Resonance | Electronics Textbook

Above resonance, the capacitive reactance decreases, drawing the larger current, thus, taking on a capacitive characteristic.

A parallel resonant circuit is resistive at resonance, inductive below resonance, capacitive above resonance. Impedance is maximum at resonance in a parallel resonant circuit, but decreases above or below resonance. Figure below Parallel resonant circuit: Impedance peaks at resonance.

A low Q due to a high resistance in series with the inductor produces a low peak on a broad response curve for a parallel resonant circuit. Figure below conversely, a high Q is due to a low resistance in series with the inductor. This produces a higher peak in the narrower response curve. The high Q is achieved by winding the inductor with larger diameter smaller gaguelower resistance wire.

Parallel resonant response varies with Q. With increasing Q factor or quality factor, so the bandwidth of the tuned circuit filter is reduced. As losses decrease so the tuned circuit becomes sharper as energy is stored better in the circuit. It can be seen that as the Q increases, so the 3 dB bandwidth decreases and the overall response of the tuned circuit increases.

In many instances a high Q factor is needed to ensure that the required degree of selectivity is achieved. In many RF applications there is a requirement for wide bandwidth operation.

Some forms of modulation require a wide bandwidth, and other applications require fixed filters to provide wide band coverage.