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English: Frederick E. Terman's "Universal Resonance Curve", a symmetric approximation to the normalized response of a resonant circuit; abscissa values are deviation from Fc in units of Fc/(2Q), the 3dB-half-bandwidth; ordinate is relative amplitude, and phase in cycles. The upper (green) dashed phase curve is from a system of two poles and no zero, which lags 90 degrees (0.25 cycle) at resonance. The other (red) dashed curves are for a pair of poles with a zero at DC (at s=0 in Laplace notation), which is what is usually approximated by the universal resonance curve, or was in Siebert; in terms of magnitude gain, it is asymmetric in the opposite direction of the green curve. These curves are calculated for a Q value of 4; higher Q values will give curves closer to the universal curve. The X's represent deviations of one half-bandwidth (plus or minus Fc/2Q, the -3dB points), gains of 0.707, and phase shifts of 45 degrees (0.125 cycle).
Date
Source self made, roughly about Siebert (1986) Circuits, Signals, and Systems p. 113
Author Richard F. Lyon, User:Dicklyon

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October 2009

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current03:14, 19 October 2009Thumbnail for version as of 03:14, 19 October 2009512 × 362 (36 KB)Dicklyon{{Information |Description={{en|1=Frederick E. Terman's "Universal Resonance Curve", a symmetric approximation to the normalized response of a resonant circuit; abscissa values are deviation from Fc in units of Fc/(2Q); ordinate is relative amplitude, and

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