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.

類型 電路圖標準 IEEE Std 315 / ANSI Y32.2引擎 schematex-circuit更新時間 2026/9/24

需求

“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.”

接著試試Change the inductor to 22 mH.Add a 10 nF capacitor across the load.

這張圖裡有什麼

看懂背後的決策。

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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常見問題

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.