Editorial Technical Reference

Local Oscillator

This page explains how Local Oscillator is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Electronic circuit that generates a stable reference frequency signal for frequency conversion in demodulation systems.

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Product Specifications

Technical details and manufacturing context for Local Oscillator

Definition
A local oscillator is a critical component within a demodulator that produces a precise, stable frequency signal used to mix with incoming modulated signals, enabling frequency down-conversion for subsequent signal processing and information extraction. This component is part of the Computer, Electronic and Optical Product Manufacturing industry and is classified as a component-level part. It is designed to operate within a frequency range of 0.1–20 GHz, with an output power of 10–15 dBm, sufficient for driving mixers. Frequency stability is maintained at ±1×10⁻⁶ over temperature, and phase noise at 10 kHz offset is between -100 and -80 dBc/Hz. Harmonic suppression relative to the fundamental is -30 to -20 dBc. The device requires a regulated 5 V DC supply (±5%) and draws 50–100 mA depending on output power. It operates over -40 to 85 °C and can be stored from -55 to 125 °C, with non-condensing relative humidity of 5–95%. All RF ports have an impedance of 50 Ω. Typical package dimensions are 25×25×10 mm, and weight ranges from 15–20 g. Materials include semiconductor materials (silicon, gallium arsenide), quartz crystal, ceramic substrates, and copper conductors. The working principle involves generating a continuous wave signal using crystal oscillators, LC circuits, or phase-locked loops, which is then mixed with the incoming RF signal to produce intermediate frequencies. When selecting a local oscillator, verify model-specific parameters such as frequency range, output power, phase noise, and supply requirements against your demodulation system's specifications. Confirm that the operating temperature and storage conditions match your environment. Check that the output power is adequate for your mixer's drive level and that harmonic suppression meets system linearity requirements. Ensure the supply voltage is regulated within the specified tolerance. For maintenance, monitor for frequency drift, increased phase noise, or output power degradation, which may indicate aging components or supply issues. Failure boundaries include operation outside the specified temperature or supply voltage ranges, which can cause performance degradation or permanent damage. Always consult the legal manufacturer or supplier for model-specific values and standards compliance.
Working Principle
The local oscillator generates a continuous wave signal at a specific frequency using crystal oscillators, LC circuits, or phase-locked loops. This signal is mixed with the incoming RF signal in a mixer to produce intermediate frequencies suitable for demodulation. The generated signal must be stable and precise to ensure accurate frequency conversion. The output power is typically 10–15 dBm to drive the mixer. The frequency stability is maintained at ±1×10⁻⁶ over temperature, and phase noise is kept low to preserve signal quality. The oscillator operates within a frequency range of 0.1–20 GHz, covering typical applications in demodulation systems.
Common Materials
Semiconductor materials (silicon, gallium arsenide), Quartz crystal, Ceramic substrates, Copper conductors
Technical Parameters
ParameterTypical rangeNotes & selection driver
Frequency Range0.1–20 GHzCovers typical applications in demodulation systems
Output Power10–15 dBmSufficient for mixer drive
Frequency Stability±1×10⁻⁶Over temperature range
Phase Noise-100–-80 dBc/HzAt 10 kHz offset
Harmonic Suppression-30–-20 dBcRelative to fundamental
Supply Voltage5 ±5% V DCRegulated supply required
Supply Current50–100 mADepends on output power
Operating Temperature-40–85 °CExtended temperature range
Storage Temperature-55–125 °CNon-operating
Relative Humidity5–95 %Non-condensing
Impedance50 ΩAll RF ports
Dimensions25×25×10 mmTypical package
Weight15–20 gDepends on package

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

Components / BOM
  • Crystal Resonator Part
    Provides precise frequency reference through piezoelectric effect
    Material: Quartz crystal with metal electrodes
  • Oscillator Circuit
    Amplifies and sustains oscillations using active components
    Material: Semiconductor transistors/ICs on silicon substrate
  • Frequency Tuning Element Part
    Allows adjustment of output frequency
    Material: Variable capacitors or varactor diodes
  • Output Buffer
    Isolates oscillator from load and provides proper signal level
    Material: Semiconductor amplifier circuits
  • Phase-Locked Loop Optional
    Locks the output to a reference so the frequency can be programmed rather than fixed by the crystal.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Demodulator
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Modulator Circuit
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Spectrum Analyzer
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Block Upconverter (BUC)
View system integration details
Frequency Converter
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RF front-end
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1 atm (standard), hermetic sealing required for non-standard environments
other spec: Frequency stability: ±1 ppm, Phase noise: -110 dBc/Hz at 10 kHz offset, Output power: +10 dBm ±2 dB
temperature: -40°C to +85°C (operational), -55°C to +125°C (storage)
Media Compatibility
✓ RF communication systems ✓ Radar and navigation equipment ✓ Test and measurement instrumentation
Unsuitable: High-vibration industrial machinery environments without proper shock mounting
Sizing Data Required
  • Required output frequency (MHz/GHz)
  • Frequency stability requirement (ppm)
  • Phase noise specification at specific offset

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Frequency Drift
Cause: Aging of crystal oscillator components, temperature fluctuations, or voltage instability affecting the resonant circuit.
Output Signal Degradation
Cause: Component fatigue in the amplifier stage, contamination or oxidation of connectors, or power supply ripple causing harmonic distortion.
Maintenance Indicators
  • Audible humming or intermittent noise from the oscillator unit indicating electrical arcing or component stress.
  • Visual signs of overheating such as discoloration or melting on the oscillator casing or nearby components.
Engineering Tips
  • Implement regular calibration and temperature compensation to maintain frequency stability and prevent drift.
  • Ensure clean, stable power supply with proper filtering to reduce electrical noise and protect sensitive oscillator components.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
IEC 61000-6-2:2019 - Electromagnetic compatibility (EMC) ANSI C63.4:2014 - Methods of measurement of radio-noise emissions

Quoted from the published standard.

Manufacturing Precision
  • Frequency stability: +/- 0.001% over operating temperature range
  • Phase noise: -120 dBc/Hz at 10 kHz offset
Quality Inspection
  • Spectrum analyzer frequency accuracy verification
  • Temperature cycling test for stability compliance

Manufacturers of Local Oscillator

Manufacturer profiles associated with Local Oscillator.

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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 · Page last updated 6 September 2026

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Frequently Asked Questions

What is the frequency range of this local oscillator?

The frequency range is 0.1–20 GHz, covering typical applications in demodulation systems. However, the actual range for a specific model must be confirmed with the manufacturer.

What supply voltage is required?

The supply voltage is 5 V DC with a tolerance of ±5%. A regulated supply is required to ensure stable operation.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C. Storage temperature is -55 to 125 °C. Non-condensing relative humidity should be 5–95%.

How do I verify the phase noise performance?

Phase noise is specified at -100 to -80 dBc/Hz at a 10 kHz offset. For your application, verify that this meets your system's requirements. Always check the manufacturer's datasheet for exact values.

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

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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