Tuesday 18 March 2014

Technology Behind OCXO 10Mhz Frequency Reference

By Gwen Lowe


In here, the crystal and the circuitry responsible for temperature sensitivity have to be kept in a controlled structure. This ensures that it is in a stable condition of temperature, which should be higher than that ambient temperature necessary for exposing OCXO 10MHz Frequency Reference. In fact, it is better if the oven is set to turnover temperature of the resonators so that it balances with the external temperature.

If the temperature is controlled, then anomalies associated with temperature effects will be reduced to minimal. These temperature anomalies have effects on the resonators and may just allow compensation within a limited allowance. Higher overtone crystals may also be used in such controlled temperatures. This is better because they are stable in controlled conditions.

These oscillators know how to enable stability as compared to others like SPXO and TCXO which do not have any temperature control mechanisms. It is the crystal units that determine temperature characteristics. Oven controlled oscillator is far much better because the oven block enables it to maintain the temperature at a stable state.

It is the dynamic and static characteristics that bring about stability. Things like the accuracy of the oven, the resonator and even some other components are responsible for the kind of stability you can get. It is at a certain recommended range that this temperature stability can perform within. The narrow ranges are better placed as it allows restriction to the needed area.

You will however, require more power for this oven controlled oscillator as its consumption is bigger. The insulator you use will however determine the amount of power you will need. If high, then know that the heat usage will be minimal, which creates room for less power use.

The oven temperature ought to be set to some high level than the renowned ambient one to enable the oven to control everything better. This calls for warming of the resonator so as to get the required heat. All these are done so that the oven can be allowed to balance to equilibrium.

Regulation is also necessary to avoid variations of voltage supply. If this happens, then disturbances are likely to be created within the oscillator frequency. This results from the difference in the power and may end up taking quite a long time to go back to equilibrium.

Since the oscillator is sensitive to load, an amplifier could be used so that multiple outputs can be obtained. This is the reason why they should be built around the oven so that temperature stability does not interfere so much. Humidity also needs to be checked because it could have some impact on the stability.

Such issues may be averted by measuring instability and modelling it to the required standards. Control mechanisms are also available and can be used for the better to avert instability. Temperature compensation can be achieved through such mechanisms. Additional characteristic like retrace is another option which can be applied for these aversion purposes.




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