INDUSTRY COMPONENT

Resonant Circuit/LC Tank

LC resonant circuit used in voltage-controlled oscillators for frequency generation and tuning.

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Component Specifications

Definition
A resonant circuit, also known as an LC tank circuit, consisting of an inductor (L) and a capacitor (C) connected in parallel or series, designed to oscillate at a specific resonant frequency determined by the values of L and C. In voltage-controlled oscillators (VCOs), it serves as the frequency-determining element, where the resonant frequency can be tuned by varying the capacitance or inductance, typically via a varactor diode controlled by an input voltage.
Working Principle
The LC tank circuit operates based on the principle of resonance, where energy oscillates between the inductor's magnetic field and the capacitor's electric field at a natural frequency f = 1/(2π√(LC)). In a VCO, the resonant frequency is adjusted by changing the capacitance (e.g., using a voltage-controlled varactor), allowing the oscillator to generate a stable, tunable output frequency proportional to the control voltage.
Materials
Inductor: Copper wire wound on a ferrite or air core; Capacitor: Ceramic, tantalum, or silicon-based (varactor) dielectric; Substrate: FR4 or high-frequency PCB material; Enclosure: Metal or plastic for shielding.
Technical Parameters
  • Power Handling Up to 1 W
  • Quality Factor (Q) 50 to 200
  • Inductance Tolerance ±5%
  • Tuning Voltage Range 0 to 5 V
  • Capacitance Tolerance ±10%
  • Temperature Stability ±50 ppm/°C
  • Resonant Frequency Range 1 MHz to 10 GHz
Standards
ISO 9001, IEC 60384, MIL-PRF-39014

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Resonant Circuit/LC Tank.

LC resonant circuit voltage-controlled oscillator VCO frequency tuning inductor capacitor tank electronic components industrial engineering Resonant Circuit/LC Tank Resonant Circuit/LC Tank in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Voltage Controlled Oscillator

An electronic oscillator whose oscillation frequency is controlled by an input voltage.

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Engineering Analysis

Risks & Mitigation
  • Frequency drift due to temperature changes
  • Component aging affecting stability
  • Electromagnetic interference (EMI)
  • Overvoltage damage to varactor diodes
FMEA Triads
Trigger: Temperature variation
Failure: Shift in resonant frequency, leading to oscillator inaccuracy
Mitigation: Use temperature-compensated components and thermal management
Trigger: Component degradation over time
Failure: Reduced Q factor and increased signal loss
Mitigation: Implement regular calibration and use high-reliability parts
Trigger: Voltage spikes
Failure: Damage to varactor diodes, causing tuning failure
Mitigation: Add protection circuits like zener diodes or filters

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Frequency tolerance within ±0.1% under specified conditions
Test Method
Swept-frequency analysis using network analyzers, temperature cycling tests per IEC 60068

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the role of an LC tank in a voltage-controlled oscillator?

The LC tank sets the resonant frequency of the oscillator, which is tuned by varying the capacitance with a control voltage, enabling precise frequency generation for applications like communication systems and signal processing.

How do you calculate the resonant frequency of an LC circuit?

Use the formula f = 1/(2π√(LC)), where f is the frequency in hertz, L is the inductance in henries, and C is the capacitance in farads.

What materials are commonly used in LC tank components?

Inductors use copper windings on ferrite cores for high Q factors, while capacitors include ceramic for stability or varactor diodes for tunability, mounted on PCBs like FR4.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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