Sine Wave OCXO Oscillators
Your Professional Sine Wave 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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Why choose us
Superior Quality
A precision supply chain ensuring consistent product quality;An ultra-low failure rate validated by rigorous testing;High-quality materials and advanced technology make the product more reliable.
Service Advantages
A customer-centric service framework (covering pre-sales consultation to post-sales support) that prioritizes rapid response. 24-hour online service, timely and fast quotation for you.
Sales Market
Our Products has expanded into key international regions including Europe, Southeast Asia, the Americas, Oceania, and other major markets. This global network enables the company to provide full support to leading electronics manufacturers around the world, while maintaining a strong focus on high-quality products.
Our Certificate
All our products have passedGB/T 19001 - 2016/ISO 9001:2015 Quality Management System Standard, This demonstrates that they meet international standards for quality, safety, and performance.
Sine Wave OCXO Oscillators
OCXO (Oven Controlled Crystal Oscillator) sine wave oscillators are electronic devices that generate a stable sine wave signal for use in a variety of applications, such as communication systems, test and measurement equipment, and frequency synthesizers. They use a crystal oscillator as a frequency reference and a temperature-controlled oven to stabilize the oscillator frequency.
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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℃) |
±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 ANNUALLY |
±0.3ppb / ±0.5ppb / ±1.0ppb |
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±30ppb / ±50ppb / ±100ppb |
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Frequency adjustment (Note 2) |
0.5~2.0ppm |
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Phase noise @10Hz Example for Sinewave @100Hz |
-102dBc/Hz |
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-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. Note 2: Frequency adjustment applies for the option with Control Voltage function, refer to page 2. |
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Advantages of Sine Wave OCXO Oscillators
Extremely Low Frequency Temperature Stability
OCXOs use a constant temperature chamber to precisely control the crystal temperature at a specific point (such as the inflection point temperature of an AT-cut crystal), eliminating the effects of ambient temperature fluctuations on frequency. Their temperature stability typically reaches ±0.01 ppb/°C to ±0.1 ppb/°C, far superior to conventional crystal oscillators (TCXOs range from ±1 ppb/°C to ±10 ppb/°C).
Ultra-Low Phase Noise
Sine-wave OCXOs utilize a low-noise amplifier and high-quality crystal to optimize phase noise to -160 dBc/Hz at 10 kHz (much lower than the -140 dBc/Hz at 10 kHz of a TCXO). Phase noise reflects short-term frequency stability and directly impacts the signal-to-noise ratio (SNR) of RF systems.
Long-Term Reliability
OCXOs utilize high-purity crystals and hermetically sealed packaging to minimize aging to ±0.05 ppb/year to ±0.5 ppb/year (TCXOs range from ±1 ppb/year to ±5 ppb/year). The aging rate reflects frequency drift over time and directly affects device lifespan.
Interference Resistance
The OCXO utilizes a dual-oven structure (an inner constant-temperature bath and an outer oven) to isolate environmental interference, ensuring stable operation within the -40°C to +85°C range (TCXOs typically operate from -20°C to +70°C).
Unique Value
The sine-wave OCXO outputs a pure sinusoidal signal (harmonic distortion <-80dBc), resulting in lower electromagnetic interference (EMI) and a higher signal-to-noise ratio (SNR) compared to square-wave OCXOs (harmonic distortion <-40dBc).
Type of Sine Wave OCXO Oscillators
AT-cut OCXOs
This is the most commonly used crystal cut. Its frequency-temperature curve is a cubic parabola, and under thermostat control, it can achieve an extremely low temperature coefficient (typically <±0.1 ppb/°C).
SC-cut OCXOs
The frequency-temperature curve is flatter, with a temperature coefficient as low as ±0.01 ppb/°C, making them suitable for extreme temperature environments.
IT-cut OCXOs
The frequency-temperature curve is between that of AT-cut and SC-cut crystals. Its temperature stability is better than that of AT-cut crystals but weaker than that of SC-cut crystals. Its phase noise is similar to that of AT-cut crystals, and its cost is moderate.
Applications of Sine Wave OCXO Oscillators
Satellite Communications
Sine-wave OCXOs provide local oscillator signals for satellite transponders. Their low phase noise prevents intermodulation distortion during signal mixing, ensuring communication quality.
Quantum Computing
Qubit manipulation requires nanosecond-level timing accuracy. The extremely low jitter of a sine-wave OCXO (<50 fSec) ensures the synchronization of laser pulses and reduces decoherence errors.
Precision Test and Measurement
Sine-wave OCXOs serve as reference sources in spectrum analyzers and network analyzers, and their frequency stability directly impacts test accuracy.
Working Principle of Sine Wave OCXO Oscillators
The core of an OCXO is the oven. This oven uses a heating element to maintain the quartz crystal resonator and its surrounding circuitry at a constant temperature (typically 20-40°C above ambient temperature), eliminating the effects of temperature fluctuations on the crystal frequency. For example:
Single-oven configuration: A single-layer oven offers a temperature stability of ±0.1°C to ±0.5°C, suitable for industrial control applications.
Dual-oven configuration (such as the Yangxing Technology YOV5050DP): An inner oven precisely controls the crystal temperature, while an outer oven isolates ambient interference, achieving a temperature stability of ±0.01°C. This configuration is suitable for extremely precise applications such as satellite navigation.
Signal purity: The output signal of sine wave OCXO is a continuous sine wave without harmonic distortion (THD is usually < -80dBc), with extremely low phase noise (typical -150dBc/Hz @ 10kHz offset).
Comparison with square-wave OCXOs: Square-wave OCXOs convert sine waves to square waves using a comparator. This makes them suitable for digital circuits (such as FPGA clock inputs), but they introduce additional jitter (increasing phase noise by approximately 10-20%). Sine-wave OCXOs directly output analog signals and are more suitable for analog circuits or high-frequency applications (such as RF mixers).
Frequency Stability
• Short-Term Stability (Allan Variance): Reflects frequency fluctuations within 1 to 100 seconds. The short-term stability of a sine-wave OCXO can achieve <1×10⁻¹² (1-second threshold).
• Long-Term Stability: Affected by crystal aging, the typical rate is ±0.5 ppb/year. High-end models (such as dual-furnace OCXOs) can be reduced to ±0.1 ppb/year through aging compensation circuitry.
Phase Noise
• Phase noise is a core metric for measuring the frequency purity of an oscillator. The phase noise curve of a sine-wave OCXO typically exhibits a 1/f³ slope in the low-frequency region, a 1/f² slope in the mid-frequency region, and white noise in the high-frequency region.
Output Amplitude and Impedance
• Output Amplitude: The output amplitude of a sine-wave OCXO is typically 0.5 Vpp to 5 Vpp (adjustable), achieved through an internal amplifier.
• Output Impedance: The standard 50Ω output impedance matches RF cables and instruments to minimize reflection losses.
Design Considerations of Sine Wave OCXO Oscillators
Power Supply Noise Suppression
Power supply ripple must be <20mV (peak-to-peak). A low-noise LDO (such as the LT3045) or DC-DC converter is recommended, along with a π-type filter (LC filter, L = 10μH, C = 0.1μF + 10μF).
Load Matching
The output of the sine wave OCXO must be transmitted via a 50Ω coaxial cable to avoid signal reflections due to impedance mismatch. If the load is high impedance (such as an oscilloscope input), a 50Ω resistor must be connected in series with the output.
Electromagnetic Shielding
The OCXO must be encapsulated in a metal package (such as aluminum or copper), and the housing must be well connected to the PCB ground to form a Faraday cage and suppress external electromagnetic interference (EMI).
Certificates
FAQ
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