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.

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Product Specifications

Technical details and manufacturing context for Voltage Controlled Oscillator

Definition
A voltage controlled oscillator (VCO) is an electronic component that generates a periodic signal, typically sinusoidal or square wave, whose frequency is a function of an applied control voltage. It is a fundamental building block in phase-locked loops (PLLs), frequency synthesizers, and clock synchronization circuits. In a typical application, the VCO is used within a clock synchronizer to produce a stable, tunable clock signal that can be precisely aligned to a reference frequency. The control voltage, often denoted as Vctrl, adjusts the frequency over a specified tuning range. The VCO's output frequency is directly proportional to the control voltage within its operating range, enabling fine adjustments for synchronization and stabilization. Key performance parameters include frequency range, tuning sensitivity, phase noise, harmonic suppression, and output power. The frequency range for this component is 10 to 1000 MHz, with a tuning voltage range of 0 to 5 V DC. Tuning sensitivity is typically 10 to 50 MHz/V, and output power ranges from 0 to 10 dBm. Phase noise is specified as -100 to -80 dBc/Hz at 10 kHz offset, and harmonic suppression is -20 to -10 dBc. The component operates from a 5 V DC supply (±10%) and consumes 20 to 50 mA. It is designed for an operating temperature range of -40 to +85 °C and a storage temperature range of -55 to +125 °C. The pulling figure is ≤1 MHz, and the pushing figure is ≤5 MHz/V. The output impedance is 50 Ω, and the typical package size is 5.0 × 3.2 × 1.2 mm. Materials used include semiconductor materials such as silicon or gallium arsenide, metals for interconnects and inductors, and dielectric materials. This VCO is intended for use in electronic systems requiring precise frequency control. It is essential to verify model-specific values and standards with the legal manufacturer or supplier before integration.
Working Principle
The core circuit of a VCO is designed so that a key parameter affecting its resonant frequency is modulated by an applied control voltage (Vctrl). For example, in an LC-tank oscillator, a varactor diode's capacitance changes with the reverse bias voltage, altering the tank's resonant frequency. In a ring oscillator, the delay of each inverter stage can be controlled by adjusting the charging current, which is set by the control voltage. As Vctrl changes, the frequency of oscillation shifts proportionally. The relationship between control voltage and frequency is typically linear over the specified tuning range, but the actual curve may have some nonlinearity. The VCO's output is then used in a feedback loop, such as a PLL, to lock onto a reference frequency. The tuning sensitivity (MHz/V) indicates how much frequency changes per volt of control voltage. Higher sensitivity provides wider tuning but can increase phase noise. The VCO must be operated within its specified supply voltage and temperature range to maintain performance.
Common Materials
Semiconductor (Silicon/GaAs), Metal (for interconnects/inductors), Dielectric materials
Technical Parameters
ParameterTypical rangeNotes & selection driver
Frequency Range10–1000 MHzOperating range; outside this range the oscillator may not sustain oscillation.
Tuning Voltage Range0–5 V DCVoltage range for frequency control; exceeding may damage input.
Tuning Sensitivity10–50 MHz/VFrequency change per volt; higher sensitivity gives wider tuning but more noise.
Output Power0–10 dBmTypical output level; may vary with frequency.
Phase Noise-100–-80 dBc/Hz @10kHzLower is better; affects signal purity.
Harmonic Suppression-20–-10 dBcAttenuation of harmonics relative to fundamental.
Supply Voltage5 ±10% V DCOperating supply; outside range may cause malfunction.
Supply Current20–50 mACurrent consumption at nominal supply.
Operating Temperature-40–85 °CAmbient temperature range for guaranteed performance.
Storage Temperature-55–125 °CTemperature range for storage without damage.
Pulling Figure≤1 MHzFrequency change with load mismatch; lower is better.
Pushing Figure≤5 MHz/VFrequency change with supply voltage variation.
Output Impedance50 ΩNominal output impedance for matching.
Package Size5.0 × 3.2 × 1.2 mmTypical SMD package dimensions.

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/LC Tank Part
    Determines the fundamental oscillation frequency.
    Material: Inductor (Metal), Capacitor (Semiconductor/Dielectric)
  • Active Device(s) (Transistor) Part
    Provides gain to sustain oscillations and compensate for circuit losses.
    Material: Semiconductor (Si, GaAs)
  • Varactor Diode Part
    Voltage-variable capacitor whose capacitance changes with control voltage to tune frequency.
    Material: Semiconductor
  • Output Buffer
    Isolates the oscillator core from load variations and provides a stable output signal.
    Material: Semiconductor

Application & selection

Application Fit & Sizing Matrix

Operational Limits
phase noise: -80 dBc/Hz to -150 dBc/Hz at 10 kHz offset (varies by design)
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, ±15V
frequency range: 1 MHz to 2.4 GHz typical (depends on technology: LC, crystal, SAW, YIG)
tuning linearity: ±1% to ±10% deviation from ideal
power consumption: 10 mW to 500 mW (depends on frequency and output power)
Media Compatibility
✓ RF communication systems (transmitters/receivers) ✓ Phase-locked loop (PLL) circuits ✓ Test and measurement equipment (signal generators, spectrum analyzers)
Unsuitable: High-vibration mechanical environments without proper mounting/shock absorption
Sizing Data Required
  • Required output frequency range (min/max)
  • Tuning sensitivity (MHz/V or GHz/V)
  • Phase noise specification at specific offset (e.g., -110 dBc/Hz at 10 kHz)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Frequency drift or instability
Cause: Aging or temperature-induced changes in varactor diode capacitance or resonator component parameters, leading to deviation from designed oscillation frequency.
Output signal degradation or loss
Cause: Failure of active components (e.g., transistors) due to thermal stress, overvoltage, or electrostatic discharge, or degradation of passive components like capacitors/resistors affecting feedback loop stability.
Maintenance Indicators
  • Audible: Unusual humming, buzzing, or intermittent noise from the oscillator circuit indicating component stress or impending failure.
  • Visual/Observable: Erratic or unstable output frequency readings on monitoring equipment, or abnormal heating of the oscillator housing suggesting thermal management issues.
Engineering Tips
  • Implement strict thermal management: Ensure adequate heat sinking, maintain ambient temperature within specified limits, and use temperature-compensated components to minimize frequency drift and extend component lifespan.
  • Apply robust electrical protection: Use voltage regulators, transient voltage suppressors, and proper grounding to shield against power surges and electrostatic discharge, and adhere to manufacturer-recommended operating voltage ranges to prevent overstress.

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
EN 61000-6-2 (Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity standard for industrial environments)

Quoted from the published standard.

Manufacturing Precision
  • Frequency Stability: +/- 0.5% over operating temperature range
  • Output Power Variation: +/- 1.5 dB across tuning voltage range
Quality Inspection
  • Phase Noise Measurement (spectrum analyzer test)
  • Temperature Cycling Test (operational verification across -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.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Voltage Controlled Oscillator

3 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Hisiwell
Chengdu, Sichuan, CN
Also makes: Power Amplifier Module, Low-Noise Amplifier, Frequency Converter and 6 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Voltage Controlled Oscillators”
View source page ↗ hisiwell.com · checked 2026-09-14
View profile Send enquiry
XtalTQ
Chengdu, Sichuan, CN
Also makes: Quartz Crystal Oscillator, Transceiver Module, Crystal Oscillator and 1 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “ Voltage Controlled Oscillator”
View source page ↗ xtaltq.com · checked 2026-09-14
View profile Send enquiry
Zhejiang Saisi Electronic Technology Co., Ltd.
Jiaxing, Zhejiang, CN
Also makes: Crystal Oscillator, Clock Generator, Clock Buffer/Driver
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Voltage-Controlled Oscillator(VCXO)”
View source page ↗ saisitime.com · checked 2026-09-18
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Frequently Asked Questions

What is the typical frequency range of this VCO?

The frequency range is 10 to 1000 MHz, as listed in the directory. However, actual performance may vary by model, so always confirm with the manufacturer's datasheet.

What control voltage range should be applied?

The tuning voltage range is 0 to 5 V DC. Exceeding this range may damage the input, so ensure the control voltage stays within these limits.

How does phase noise affect system performance?

Phase noise is a measure of short-term frequency stability. Lower phase noise (more negative dBc/Hz) indicates a cleaner signal, which is critical in communication and clock synchronization applications. The specified range is -100 to -80 dBc/Hz at 10 kHz offset.

What are the operating temperature limits?

The operating temperature range is -40 to +85 °C. Storage temperature range is -55 to +125 °C. Operating outside these ranges may cause malfunction or damage.

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:

Clock Synchronizer
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

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 30 September 2026

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