Electrical Engineering › Section L · Power (ac) and resonance › Topic L.6
Impedance versus frequency and selectivity
A tuned circuit is only useful if it responds strongly near its resonant frequency and weakly elsewhere. Plotting impedance and current against frequency shows how sharp that response is, and the bandwidth puts a number on it.
In this topic
- Beyond the resonant frequency
- Impedance versus frequency
- Phase versus frequency
- The selectivity curve and half-power frequencies
- Bandwidth and the quality factor
- The high-Q shortcut
- Worked example: a low-Q circuit
- Worked example: designing for a bandwidth
- How VR, VL and VC vary
- Common mistakes to avoid
- Key takeaways
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