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OCXOs boasts phase noise performance of -172dBc/Hz at 100kHz

Posted: 06 Jun 2013 ?? ?Print Version ?Bookmark and Share

Keywords:IQD? OCXO? oscillator? phase noise?

IQD has debuted its new IQOV-200 series Oven Controlled Crystal Oscillator (OCXO). The oscillators are designed up to optimise low phase noise performance caused by semiconductor thermal noise. The company's latest series of OCXOs deliver phase noise performance of -172dBc/Hz at 100kHz offset and -160dBc/Hz at 1kHz offset based on a nominal oscillating frequency of 100MHz.

The new model is available in a frequency range of 80MHz to 130MHz and is initially housed in a 36x27mm IEC C008 Euro package. Available at any frequency in the range 80MHz to 130MHz, the new model is housed in an industry standard 36x27mm IEC C008 Euro package although other package styles including surface mount variants can be considered to suit specific customer applications. The oscillator nominally operates from a 12V power supply and consumes just 1Watt of power at steady state, incorporating a very high level of internal voltage regulation. Drive capability is quoted at 6dBm into 50Ohms.

Operating over a standard temperature range of -20 to 60C with an initial frequency stability of 50ppb (parts per billion), other temperature ranges and stabilities can be considered as required.

The key component within any quartz oscillator is the quartz crystal and the IQOV-200 series' long term ageing rates are particularly low due to the very high quality and processing of the quartz crystal.

The new model incorporates a SC-cut (Stress Compensated) HC43 cold welded crystal as exhaustive research has shown that this style of package offers much less stress on the crystal than the more commonly used multiple mounting point systems. This has a direct effect in improving the oscillator's close-in phase noise. The actual drive circuitry has its most direct influence on the far-out phase noise performance. Inevitably both aspects are somewhat interactive so a fine engineering balance has to be struck.

There are many potential applications for this high specification OCXO including ground and airborne radar equipment (both military and commercial); military digital communications systems; satellite communications such as 'Very Small Aperture Terminal (VSAT) C for data transfer from a remote ground terminals to high orbiting satellite such as the Inmarsat system with minimal distortion; high performance Global Positioning Systems (GPS); phase locked microwave signal sources and frequency synthesisers and signal generators. Phase noise or phase jitter is of particular importance because it reduces the signal quality and hence increases the bit error rate of a communications system.

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