Parallel RLC Resonant Tank Circuit

Parallel RLC Resonant Tank

A parallel RLC circuit connects a resistor, inductor, and capacitor across the same two nodes. Around resonance, the inductor and capacitor exchange energy and their reactive currents largely cancel at the source. The remaining loss resistance controls the sharpness of the response. This small schematic is useful for explaining tank circuits, selective loads, and the difference between parallel and series resonance. The source is shown as an AC test signal; in a real oscillator, an active device supplies the sustaining energy. Choose real component values and include coil resistance, loading, and parasitic capacitance when the design will be built. Record the expected resonant frequency beside the drawing.

Type Schéma électriqueNorme IEEE Std 315 / ANSI Y32.2Moteur schematex-circuitMis à jour 24/09/2026

La demande

“Draw a parallel RLC resonant tank with a 1 MHz AC source, a 25 µH inductor, a 1 nF capacitor, and a 1 kΩ loss resistor.”

Essayez ensuiteChange the capacitor to 470 pF.Add a 10 kΩ load resistor.

Ce que contient ce dessin

Comprenez les décisions qui le sous-tendent.

01Topology

Place R, L, and C across the same two nodes.

02Drive

Use a small AC source for frequency analysis.

03Loss

Model damping with a parallel resistor.

Use to show a parallel resonant tank or a basic tuned load.

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FAQ

Questions fréquentes

What is parallel resonance?

It is the frequency where a parallel inductor and capacitor have opposing reactive currents, producing high input impedance.

What sets the resonant frequency?

Inductance and capacitance set it approximately as 1 divided by 2π times the square root of LC.

Why add a resistor?

It represents losses or loading that limit the circuit Q.