Editorial Technical Reference

Voltage-Controlled Oscillator

This page explains how Voltage-Controlled 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

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

View Full Specifications Explore Manufacturing Sources

Product Specifications

Technical details and manufacturing context for Voltage-Controlled Oscillator

Definition
A voltage-controlled oscillator (VCO) is a critical component within a frequency synthesizer that generates an output signal whose frequency is directly proportional to the applied control voltage. This enables precise frequency tuning and modulation capabilities in RF and communication systems. The VCO converts a DC control voltage into a corresponding AC output frequency using active devices (like transistors) within a resonant circuit (LC tank or crystal). As the control voltage changes, it alters the capacitance of varactor diodes or the operating point of active components, thereby shifting the resonant frequency of the oscillator circuit. Typical parameters include a frequency range of 10–1000 MHz, a tuning voltage of 0–5 V DC, output power of 0–10 dBm into 50 Ω, phase noise of -100 to -80 dBc/Hz at 10 kHz offset, harmonic suppression of -20 to -10 dBc, supply voltage of 5 V ±5%, supply current of 20–50 mA, operating temperature of -40 to 85 °C, tuning sensitivity of 10–100 MHz/V, output impedance of 50 Ω, pulling figure ≤2 MHz, pushing figure ≤1 MHz/V, package size of 5.0 × 3.2 × 1.2 mm, and weight of 0.5–1.0 g. Materials typically include semiconductor substrates (e.g., Silicon, GaAs), metal interconnects (e.g., Copper, Aluminum), dielectric materials, and packaging materials (e.g., Ceramic, Epoxy). These values are typical reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The VCO is used in phase-locked loops, frequency modulators, and test equipment. When selecting a VCO, consider the required frequency range, tuning voltage, phase noise, and output power. Verify that the supply voltage and current meet your system's capabilities. Check the operating temperature range for your environment. Confirm the package size and weight for your PCB layout. For maintenance, monitor for frequency drift, increased phase noise, or output power variations, which may indicate component aging or damage. Failure boundaries include operation outside the specified voltage, temperature, or load conditions, which can cause permanent damage.
Working Principle
The VCO converts a DC control voltage into a corresponding AC output frequency using active devices (like transistors) within a resonant circuit (LC tank or crystal). As the control voltage changes, it alters the capacitance of varactor diodes or the operating point of active components, thereby shifting the resonant frequency of the oscillator circuit. The output frequency is directly proportional to the control voltage, enabling linear tuning. The active device compensates for losses in the resonant circuit, sustaining oscillation. The varactor diode's capacitance varies with reverse bias voltage, which is controlled by the input voltage, thus changing the resonant frequency. This principle allows for precise frequency control in RF and communication systems.
Common Materials
Semiconductor substrate (e.g., Silicon, GaAs), Metal interconnects (e.g., Copper, Aluminum), Dielectric materials, Packaging materials (e.g., Ceramic, Epoxy)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Frequency Range10–1000 MHzTypical tuning range; wider ranges available on request
Tuning Voltage0–5 V DCControl voltage for frequency tuning
Output Power0–10 dBmTypical output power into 50 Ω
Phase Noise-100–-80 dBc/Hz @ 10 kHz offsetLower is better for signal purity
Harmonic Suppression-20–-10 dBcRelative to fundamental
Supply Voltage5 ±5% V DCOperating supply voltage
Supply Current20–50 mATypical current consumption
Operating Temperature-40–85 °CGuaranteed performance range
Tuning Sensitivity10–100 MHz/VFrequency change per volt
Output Impedance50 ΩNominal output impedance
Pulling Figure≤2 MHzFrequency change with 12 dB return loss
Pushing Figure≤1 MHz/VFrequency change with supply voltage variation
Package Size5.0 × 3.2 × 1.2 mmSMD package
Weight0.5–1.0 gTypical weight

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
  • Resonant Circuit
    Determines the oscillation frequency; typically an LC tank circuit or crystal resonator
    Material: Inductor coils, capacitor elements, quartz crystal
  • Active Device
    Provides gain to sustain oscillations; typically transistors (BJT, FET) or operational amplifiers
    Material: Semiconductor (Silicon, GaAs, SiGe)
  • Varactor Diode Part
    Voltage-variable capacitor that changes capacitance with control voltage to tune frequency
    Material: Semiconductor junction with voltage-dependent capacitance
  • Bias Network Part
    Provides proper DC operating points for active components
    Material: Resistors, capacitors, DC blocking elements
  • Output Buffer
    Isolates the oscillator core from load variations and provides impedance matching
    Material: Transistors, matching networks

Application & selection

Application Fit & Sizing Matrix

Operational Limits
phase noise: -80 dBc/Hz to -150 dBc/Hz at specified offset
temperature: -40°C to +85°C (industrial grade), -55°C to +125°C (military grade)
voltage range: Control voltage: 0-5V or 0-10V typical, Supply voltage: 3.3V, 5V, ±12V depending on design
frequency range: 1 MHz to 2.4 GHz typical (specific to model)
tuning linearity: ±1% to ±10% deviation from ideal
power consumption: 10 mW to 500 mW depending on frequency and topology
Media Compatibility
✓ RF communication systems ✓ Phase-locked loop circuits ✓ Test and measurement equipment
Unsuitable: High-vibration mechanical environments without proper mounting/shock absorption
Sizing Data Required
  • Required output frequency range (min/max)
  • Control voltage range and tuning sensitivity (MHz/V)
  • Phase noise requirements at specific frequency offsets

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Frequency drift or instability
Cause: Thermal expansion of components, aging of varactor diodes, or degradation of tuning voltage control circuits leading to parameter shifts.
Output signal degradation or loss
Cause: Failure of active components (transistors, ICs) due to thermal stress, voltage spikes, or contamination of resonant elements (crystals, LC circuits) affecting oscillation.
Maintenance Indicators
  • Audible humming or buzzing from the oscillator circuit indicating harmonic distortion or instability
  • Visual signs of overheating (discoloration, thermal stress marks) on the oscillator housing or nearby components
Engineering Tips
  • Implement strict thermal management: Use heat sinks, active cooling, or thermal interface materials to maintain stable operating temperatures and reduce thermal cycling stress.
  • Apply voltage regulation and filtering: Ensure clean, stable power supply with surge protection to prevent voltage spikes and noise that can degrade oscillator performance.

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 60068-2-6 (Vibration testing) MIL-STD-883 (Test methods for microcircuits) EN 55032 (Electromagnetic compatibility)

Quoted from the published standard.

Manufacturing Precision
  • Frequency stability: +/- 0.5% over temperature range
  • Output power variation: +/- 1.5 dB across tuning range
Quality Inspection
  • Phase noise measurement (spectrum analyzer test)
  • Temperature cycling test (-40°C to +85°C)
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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Voltage-Controlled Oscillator

Manufacturer profiles associated with Voltage-Controlled Oscillator.

Sourcing Voltage-Controlled Oscillator from China?
Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.
Request manufacturers We manufacture this

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Buyer enquiry

Request manufacturing insight for Voltage-Controlled Oscillator

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What to include
Share your product specifications, quantity, destination and target delivery date.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at [email protected].

Frequently Asked Questions

What is the typical frequency range of a VCO?

The typical frequency range is 10–1000 MHz, but wider ranges may be available on request. Always verify the exact range for the specific model with the manufacturer.

How does the tuning voltage affect the output frequency?

The output frequency is directly proportional to the applied control voltage. A change in tuning voltage alters the capacitance of varactor diodes, shifting the resonant frequency of the oscillator circuit.

What are the key parameters to consider when selecting a VCO?

Key parameters include frequency range, tuning voltage, output power, phase noise, harmonic suppression, supply voltage and current, operating temperature, tuning sensitivity, output impedance, pulling and pushing figures, package size, and weight. Verify these with the manufacturer for your application.

What are common signs of VCO failure?

Common signs include frequency drift, increased phase noise, or output power variations. These may indicate component aging or damage. Operating outside specified voltage, temperature, or load conditions can cause permanent failure.

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

Related equipment

Applied To / Applications

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

Frequency Synthesizer
View system integration details
Clock Generator / PLL
View system integration details
Clock Recovery Unit
View system integration details
Phase-Locked Loop Circuit
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

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

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.

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 12 October 2026

Need to Manufacture Voltage-Controlled Oscillator?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
XY Positioning Stage
Last Product
Get QuotesChat