For a series resonant circuit, Since
Since the impedance is low, the circuit readily accepts current; it is known as an acceptor circuit. Voltage magnification (magnification factor, Q) is the ratio
For a parallel resonant circuit, approximately. Impedance at the resonant
frequency =
and is termed the dynamic resistance
(RD). Since the impedance is high, the circuit does
not readily accept current; it is known as a rejector circuit.
Current magnification is the ratio
On a response curve, the bandwidth is measured at 70.7% of the maximum response.
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