Series RLC Bandpass Filter
A series RLC bandpass circuit passes most signal near its resonant frequency because the inductive and capacitive reactances cancel there. Away from resonance, either the inductor or capacitor presents more impedance and reduces current through the load. The series resistor represents intentional damping or the source resistance that sets the bandwidth. This topology is a clear starting point for radio tuning and filter lessons. Treat the output level as dependent on source and load impedance; practical designs also account for inductor resistance, capacitor tolerance, and the impedance of the next stage. Calculate the target frequency before choosing standard values. Document the expected source impedance as well.
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Scenario
Series-resonant bandpass path
Key decisions
- Series path: Put R, L, and C in the signal path.
- Load: Show where the filtered output is taken.
- Damping: The resistor sets bandwidth with the other values.
When to reuse this
Use for a simple series-tuned bandpass example.
Frequently asked questions
Why is a series RLC circuit bandpass?
What sets its bandwidth?
Where is the output measured?
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