LC Tank Circuit: Inductance Range 10 nH to 10 μH

Component Specifications

Definition

An LC tank circuit, also known as an LC resonant circuit or tuned circuit, is a fundamental electronic component in RF oscillators that combines an inductor (coil) and a capacitor to create a resonant frequency determined by the formula f = 1/(2π√(LC)). This circuit exhibits maximum impedance at its resonant frequency, allowing it to selectively amplify or generate signals at that specific frequency while attenuating others. In RF oscillators, it serves as the frequency-determining element that establishes stable oscillation through energy exchange between the magnetic field of the inductor and the electric field of the capacitor.

Working Principle

The LC tank circuit operates on the principle of electromagnetic resonance. When energized, electrical energy oscillates between the inductor's magnetic field and the capacitor's electric field at a natural resonant frequency. The inductor stores energy in its magnetic field when current flows through it, while the capacitor stores energy in its electric field when voltage is applied across it. This energy exchange creates continuous oscillation at the resonant frequency, with losses compensated by the oscillator's active components to maintain sustained oscillation.

Materials

Inductor: Copper wire (typically enamel-coated) wound on ceramic, ferrite, or air core; Capacitor: Ceramic dielectric (NPO/C0G for stability), mica, or silver mica for high-frequency applications; PCB: FR-4 substrate with copper traces; Housing: Aluminum shielding for EMI protection.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Q Factor	50-200 (quality factor indicating selectivity)
Tolerance	±5% for frequency-critical applications
Inductance Range	10 nH to 10 μH
Capacitance Range	1 pF to 1000 pF
Resonant Frequency	1 MHz to 300 MHz typical for RF oscillators
Temperature Coefficient	±30 ppm/°C for stable applications

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60384, IEC 60115, MIL-PRF-55681

Parent Products

This component is used in the following industrial products

RF Oscillator

Electronic circuit that generates a continuous radio frequency signal for transmission

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Engineering Analysis

Risks & Mitigation

Frequency drift due to temperature variations
Component aging affecting stability
Electromagnetic interference (EMI)
Mechanical vibration sensitivity
Parasitic capacitance/inductance effects

FMEA Triads

Trigger: Capacitor dielectric absorption
Failure: Frequency instability and phase noise
Mitigation: Use low-absorption capacitors (NPO/C0G), implement temperature compensation

Trigger: Inductor core saturation
Failure: Non-linear response and harmonic distortion
Mitigation: Use air-core or high-saturation core materials, limit current levels

Trigger: Poor shielding
Failure: EMI susceptibility and radiation
Mitigation: Implement proper grounding, use shielded enclosures, optimize PCB layout

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Frequency stability: ±0.1% to ±0.01% for precision applications; Temperature range: -40°C to +85°C standard, -55°C to +125°C extended

Test Method

Network analyzer measurement (S-parameters), impedance analyzer, frequency counter for resonance verification, temperature cycling tests

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of LC Tank Circuit

Manufacturer profiles associated with LC Tank Circuit.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What determines the resonant frequency of an LC tank circuit?

The resonant frequency is determined by the values of inductance (L) and capacitance (C) according to the formula f = 1/(2π√(LC)). Lower L and C values yield higher frequencies.

Why is the Q factor important in LC tank circuits?

The Q factor (quality factor) indicates the selectivity and bandwidth of the circuit. Higher Q means sharper resonance, better frequency selectivity, and lower energy loss, but narrower bandwidth.

How does temperature affect LC tank circuit performance?

Temperature changes affect inductor and capacitor values, causing frequency drift. Temperature-stable components (NPO/C0G capacitors, stable core materials) and compensation techniques minimize this effect.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

LC Tank Circuit