OCXO Oscillators
An OCXO is a crystal oscillator that houses the quartz crystal within a temperature-controlled oven, maintaining the crystal's temperature essentially constant. It typically utilizes either high-precision SC-cut or cost-effective AT-cut quartz crystals for the resonator. HCI's OCXOs achieve frequency stability on the order of 10⁻⁹, featuring exceptionally low aging rates, low phase noise, high short-term stability, and excellent resistance to vibration and shock. They are widely used in communication base stations, microwave radar systems, precision instruments, telemetry, and navigation equipment.
Your Professional OCXO Oscillators Supplier
Suzhou Hangjing Elec & Tech Co., Ltd., founded in 2014, is a technology-driven small and medium-sized enterprise (SME) specializing in the full-spectrum R&D, design, production, and sales of quartz frequency control components. Rooted in a professional team and advanced manufacturing expertise, the company has developed a robust product portfolio encompassing quartz crystals, crystal oscillators, TCXO, VCXO, OCXO, crystal filters-ranging from foundational components to tailored systems.
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SC-Cut CMOS OCXO 9.7 X 7.5Engineered for extreme environments, the OS97H4 series OCXO delivers high-precision timing in a compact 9.7x7.5mm SMD package. Its HCMOS output and exceptional stability make it ideal for critical...read more -
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Sine Wave OCXO Oscillator 36 X 27The Sine Wave OCXO Oscillator 36 x 27 OD36S5 series is a 36x27x11mm CMOS surface-mount device (SMD) featuring a ceramic seam seal package. It is used in Base station/ Satellite equipment and Test...read more -
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COMS Oven Controlled Crystal Oscillator 36 X 27
OCXO stands for “Oven Controlled Crystal Oscillator”. It is a quartz crystal-based timing device (clock) used in precision timing functions. Its high frequency stability makes its signal more precise and offers outstanding aging performance relative to the other quartz crystal oscillators: Temperature Controlled Xtal Oscillator (TCXO), Voltage Controlled Xtal Oscillator (VCXO), and Xtal Oscillator (XO).
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FREQUENCY SPECIFICATIONS (dependent on crystal type) |
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PARAMETER |
For SC-cut crystal |
For AT-cut crystal |
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Frequency tolerance @+25°C |
±100ppb ~ ±500ppb |
EOL |
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Frequency stability (Note 1) |
±0.05ppb / ±1ppb / ±10ppb |
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Short term stability |
±0.01ppb/s |
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Stability versus voltage |
±0.5ppb |
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Aging rate DAILY |
±0.3ppb / ±0.5ppb / ±1.0ppb |
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ANNUALLY |
±30ppb / ±50ppb / ±100ppb |
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Frequency adjustment (Note 2) |
0.5 ~ 2.0ppm |
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Phase noise @10Hz |
-102dBc/Hz |
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Example for Sinewave @100Hz |
-135dBc/Hz |
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Output 100MHz 12V @1kHz |
-162dBc/Hz |
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@10kHz |
-175dBc/Hz |
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@100kHz |
-180dBc/Hz |
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Note 1: Frequency stability is the frequency deviation over operating temperature range. |
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Features of COMS Oven Controlled Crystal Oscillator 36 X 27
Temperature-Controlled Oven: The core of an OCXO is a temperature-controlled oven that houses the crystal resonator. The oven is designed to maintain a constant temperature around the crystal resonator, typically within a narrow temperature range (e.g., ±0.1°C or better).
Thermal Regulation: The temperature-controlled oven uses a heating element and a thermostat to regulate the temperature around the crystal resonator. The oven’s temperature is continuously monitored and adjusted to compensate for temperature variations in the environment.
Quartz Crystal Resonator: OCXOs use a high-quality quartz crystal resonator as the frequency-determining element. The crystal resonator provides high stability and precision to the oscillator’s output frequency.
High Stability: OCXOs offer exceptionally high frequency stability over time, temperature variations, and other environmental factors. The tight temperature control provided by the oven ensures that the crystal resonator’s frequency remains stable and precise.
Low Phase Noise: OCXOs typically exhibit low phase noise characteristics, making them suitable for applications requiring clean and stable clock signals with minimal jitter.
Warm-Up Time: OCXOs may require a certain warm-up time to stabilize their output frequency after power-up or temperature changes. The warm-up time depends on factors such as the design of the temperature-controlled oven and the stability requirements of the oscillator.
Frequency Stability: OCXOs offer frequency stability on the order of parts per billion (ppb) or even fractions of ppb over time and temperature variations. This level of stability allows OCXOs to maintain accurate timing and synchronization in demanding applications.
Output Waveform: The output signal of an OCXO can be sinusoidal or square wave, depending on the specific oscillator circuit design and application requirements.
Advantages of COMS Oven Controlled Crystal Oscillator 36 X 27
Temperature stability
In view of the use of the temperature controlled oven, the temperature stability of an OCXO s very much better than that of a TCXO and certainly an ordinary crystal oscillator.
Frequency accuracy
As the temperature stability of OCXOs is far better than other forms of crystal oscillator, it is sense to match the improved temperature stability with high accuracy quartz crystals to ensure a high level of basic accuracy.
Overall performance
As the improved temperature stability of OCXOs adds additional cost to the unit (the oven and additional circuitry as well as mechanical items), the overall performance is normally enhanced to match the improved temperature stability.
Type of COMS Oven Controlled Crystal Oscillator 36 X 27
The Basic OCXO
OCXOs are required when a simpler temperature compensated crystal oscillator (TCXO) can't meet the demands of a challenging working environment for precise frequency control applications. All crystals have a "turning point," the optimal temperature at which equal changes in temperature will result in a minimum change in frequency.
The Ultra-Stable OCXO
Ultra-stable OCXOs feature a simple surface-mountable design with very high stability vs. temperature, as well as quick warm up, low age rates, and minimal phase noise. They are available in two footprint sizes for a perfect fit for your applications.
The Double Oven Controlled Crystal Oscillator (DOCXO)
Basic OCXOs provide frequency stability in the 50 parts per billion (ppb) range. As the RF spectrum becomes increasingly crowded with telecommunication devices and new expanding technologies, frequency control now requires precision to 1 ppb. Clean source signals for clocks in microwave communications, high-accuracy medical, measuring, and testing devices, and sources for instrument reference are all applications that require the 1 ppb precision of DOCXOs.
Telecommunication: OCXOs are required to produce precise synchronization and timing between cellular networks, satellite communications, and internet backhauls with stable frequency, low jitter, and minimal phase noise.
Military technologies: Highly accurate timing reference from OCXO is required for radar systems and navigation in military technologies.
Instrumentations
Advanced research facilities including particle accelerator and telescopes are based on the accurate timing of OCXO.
Smart grid applications
The efficient energy distribution and monitoring require precise timing references between grid components which is done by OCXO.
Financial transaction process
Accurate time stamping and synchronization are critically used by stable frequency generators in any trading platform and transaction process.
Temperature sensitivity: It measures the temperature-induced frequency variation of the crystal; the better crystal is less sensitive to temperature variation.
Power consumption: Especially portable systems the power consumption of OCXO is also one parameter, the system must be design to use optimized power.
Frequency stability: The main performance metric of the oscillator is frequency stability, measures the stability level of oscillating frequency in terms of parts per million of parts (ppm) per billion (ppb). The well-designed OCXOs are more stable and highly required for time precision applications.
Aging Rate, reliability, and lifetime of the crystal are also other important performance parameters of OCXO.
How OCXOs Work of COMS Oven Controlled Crystal Oscillator 36 X 27
Crystal Oscillator: At the core of the OCXO is a quartz crystal that oscillates at a precise frequency. The crystal’s frequency can vary with temperature changes, which can affect the oscillator’s performance.
Temperature-Controlled Oven: The crystal is housed in a temperature-controlled oven. This oven is equipped with a heating element and a temperature sensor. The heating element keeps the oven at a constant temperature, typically higher than the maximum expected ambient temperature.
Control Circuit: A control circuit monitors the temperature inside the oven using the temperature sensor. It adjusts the heating element to maintain a stable temperature, ensuring the crystal operates in an optimal environment.
By keeping the crystal at a constant temperature, the OCXO significantly reduces frequency variations, providing exceptional stability and precision for applications requiring reliable timing and frequency control.
How to choose COMS Oven Controlled Crystal Oscillator 36 X 27
Frequency Stability
Look for an OCXO with low frequency drift to maintain precise timing over a range of temperatures. This is crucial for applications requiring long-term accuracy, like telecommunications or GPS systems.
Phase Noise
Choose an OCXO with low phase noise if your application involves sensitive signal processing or communications, as it affects signal clarity and system performance.
Power Consumption
Ensure the power requirements align with your system’s capabilities. Low power consumption is particularly important for battery-operated or energy-efficient devices.
Environmental Conditions
Assess the operating temperature range and resistance to environmental factors like vibration or humidity, especially for applications in harsh or fluctuating conditions.
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