Series RLC Bandpass Filter Circuit

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.

Tipo Diagrama de circuitosNorma IEEE Std 315 / ANSI Y32.2Motor schematex-circuitActualizado 24/9/2026

La solicitud

“Draw a series RLC bandpass circuit with a 1 V AC input, 100 Ω resistor, 10 mH inductor, 100 nF capacitor, and 1 kΩ output load.”

Entonces pruebaChange the inductor to 22 mH.Add a 10 nF capacitor across the load.

Qué hay en este dibujo

Lee las decisiones que hay detrás.

01Series path

Put R, L, and C in the signal path.

02Load

Show where the filtered output is taken.

03Damping

The resistor sets bandwidth with the other values.

Use for a simple series-tuned bandpass example.

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Preguntas frecuentes

Preguntas habituales

Why is a series RLC circuit bandpass?

Its impedance is lowest near resonance, so more signal current reaches the load at that frequency.

What sets its bandwidth?

Resistance relative to inductance and capacitance determines damping and therefore bandwidth.

Where is the output measured?

This example takes output across the load resistor after the series-tuned path.