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# selectivity for series LCR?

wat is the definition for selectivity of a series LCR circuit

is it directly proportional to the bandwidth?

### 2 Answers

- 1 decade agoFavorite Answer
selectivity of a series LCR circuit is its characteristic to allow certain frequencies to pass through while attenuating others.

- Bob D1Lv 71 decade ago
Well, in a series RLC circuit, maximum current flows at the resonant frequency (effective impedance across the LC network goes to zero, which means that the current flow between the source and ground will be at a maximum), falling off rather sharply on either side of 3 dB points (half-power points) of resonance.

It is just the opposite of the parallel tuned RLC circuit where voltage rise to a maximum at resonant frequency (effective impedance across the network goes to infinity, or nearly so, which means that current flow between the source and ground will be zero, or nearly so), then falls off sharply on either side of 3dB (half-power points) of resonance.

+/- 3dB half-power points (0.707 x resonant peak) are the effective bandwidth for the given RLC circuit.

Source(s): self