OCXO Oven Controlled Crystal Oscillators

OCXO stands for “Oven Controlled Crystal Oscillator.” Also referred to as a crystal oven, this type of crystal oscillator features higher-frequency stability and is considered a top performer for the precision of its frequency signals. Oven-controlled crystal oscillators rely on above-normal levels of heat to stabilize and maintain a consistent temperature. These units contain a built-in heater, which is why they are much larger than simple crystal units. Some of the most essential communications technology, such as radio transmitters, cellphone towers, military communication signals and other radio equipment, depends on the precision-grade frequency stability that an OCXO has to offer.

An OCXO oscillator maintains temperature stability by running a temperature-controlled chamber. The unit keeps quartz crystals at a constant temperature to avoid any variations in frequency. Given that thermal insulation and a heater are required for the quartz crystals to warm up to temperature, an OCXO is physically larger than other crystal units. The thermal insulation serves as a shield to help protect the OCXO from ambient temperature fluctuations, which is why this premium unit is touted for its precision timing.

An OCXO experiences minimal frequency drift while aging, which preserves the integrity of the oscillator. These oscillators allow for precise customization for required frequency levels based simply on the angle of the crystal cuts. In addition, an OCXO does not require an excessive amount of energy to maintain the same frequency once warmed up.

An OCXO experiences minimal frequency drift while aging, which preserves the integrity of the oscillator. These oscillators allow for precise customization for required frequency levels based simply on the angle of the crystal cuts. In addition, an OCXO does not require an excessive amount of energy to maintain the same frequency once warmed up.

When it comes to frequency accuracy in an oscillator, an OCXO is the reliable choice due to its ability to avoid fluctuations in temperature once the crystal has reached its working temperature. The above-normal working temperature of an OCXO provides frequency stability and can maintain precise levels over a long time and even in adverse temperature conditions.

There is no question that an OCXO is the premium solution for electronics and communications technologies that rely upon precise and stable frequency signals to function properly. High-quality OCXOs deliver stable frequencies and maintain temperatures for an extended time without requiring excessive power consumption.

The most significant source of power consumption while operating an OCXO is in the energy required to warm it up to its working temperature. Fortunately, the OCXO stabilizes after a few moments and resumes typical power consumption. High-efficiency OCXO options are available to enable minimal power consumption and maximum performance quality even with ambient temperature variations.

Clocks that maintain a higher degree of frequency are typically used to synchronize OCXOs. If the OCXO and the clock become unlocked or unsynchronized at any point, then the OCXO reverts to its internal controls to maintain stability during what is known as the holdover period. Thus, OCXO clocks perform consistently over time without interruptions in their timekeeping output.

The most crucial element in ensuring the precision and stability of a crystal’s frequency is an accurate cut. To maximize the performance of an OCXO, setting regular intervals to recalibrate the OCXO will improve its longevity. Also, the buffering circuitry and assembly of the OCXO should reflect attention to detail so that the components of the OCXO facilitate its stable operating temperature.

The typical oven range of temperatures for OCXOs is between 75 and 80 degrees Celsius. Higher temperature ranges may be preferable in certain industrial settings and will depend on the specific application of the OCXO.