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series RLC
Inductor, capacitor, resistor in a row, output taken across R. It rings. At one frequency the inductor and capacitor cancel and everything gets through; away from it, not much does.
R = 100 Ω, L = 10 mH, C = 100 nF gives f0 = 5032.9 Hz, Q = 3.162 (that's √10), bandwidth 1591.5 Hz. The poles sit at s = -5000 ± j31225, with a zero at the origin.
ngspice: phase crosses zero at 5032.9 Hz. The script says 5032.9. Close enough for a sweep with 400 points per decade. |
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