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OCXOs, VCXOs, TCXOs

An Oven Controlled Crystal Oscillator (OCXO) is an oscillator operated inside a temperature controlled oven which keeps the crystal and the oscillator circuit at a constant temperature. The overall stability of OCXOs is far superior to that of other crystal oscillators. OCXOs are widely used in telecommunications, satellite, broadcast and other professional applications.

Temperature compensated crystal oscillators (TCXOs) offer excellent temperature characteristics with low power consumption and fast warm-up. Most models of TCXOs also offer a facility to adjust the frequency by means of an external control voltage. These are known as VCTCXOs, and typically offer pulling ranges of 8 ~ 16ppm. They do not offer as wide a pulling range as a VCXO. Golledge offer a choice of TCXOs and VCTCXOs for every use, including GTXO-253, our 2.5×2.0mm TCXO/VCTCXO for GPS applications, offering stabilities down to 0.5ppm over -30+85°C running off a supply voltage of 1.8V.

Voltage Controlled Crystal Oscillators (VCXOs) are commonly used in applications where it is necessary to lock a local oscillator to another frequency source, such as a clock recovery circuit. The stability of VCXOs is less than that of a VCTCXO, and the pullability is far greater. Typically the stability of a VCXO will be between ±20ppm and ±100ppm, whilst the pullability will be in the range from ±25ppm to ±200ppm.
Golledge offer a wide range of VCXOs to suit all applications.

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OCXOs, VCXOs, TCXOs

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