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LC Resonator Calculator
Calculate LC resonant frequency, required inductance, required capacitance, reactance, Q factor, and bandwidth for tank circuits and RF filters.
Input Parameters
Results
For RF work, include parasitic capacitance and inductor SRF when choosing components.
Equations Used
Resonant Frequency:
f0 = 1 / (2π × sqrt(LC))
Inductance:
L = 1 / [(2πf)^2 × C]
Capacitance:
C = 1 / [(2πf)^2 × L]
Q Factor:
Q ≈ X / Rseries
Bandwidth:
BW ≈ f0 / Q
Frequently Asked Questions (FAQ)
Q1: What does this LC resonator calculator do?
It solves resonant frequency, inductance, or capacitance for an LC tank circuit.
Q2: What is resonance in an LC circuit?
At resonance, inductive and capacitive reactance have equal magnitude and opposite sign.
Q3: Why include series resistance?
Series resistance reduces Q and broadens bandwidth.
Q4: Does parasitic capacitance matter?
Yes. At RF, coil capacitance, PCB capacitance, and device capacitance can shift resonance.
Q5: Can this design RF filters?
It provides the resonant element values, but complete filters need topology and impedance matching design.
Q6: Why is measured resonance different?
Component tolerance, SRF, ESR, layout parasitics, and dielectric loss can shift the real frequency.
