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US 7,253,694 B2Granted
Temperature compensated oven controlled crystal oscillator
AssigneeC-Mac Quartz Crystals Limited
InventorsNigel Hardy, Karl Ward
Life of this patent
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Abstract
A method provides a temperature controlled frequency source. The method reduces the effects of temperature variations on an operating frequency of the temperature controlled frequency source by temperature compensating the temperature controlled frequency source.
Claims8
A method of compensating for temperature-dependent behavior of a tunable circuit, the method comprising:
- providing a temperature controlled frequency source;
- and
- reducing the effects of temperature variations on an operating frequency of the temperature controlled frequency source by temperature compensating the temperature controlled frequency source on the basis of temperature correcting data derived during a calibration process, said calibration process including activating temperature control of the temperature controlled frequency source;
- wherein heating of the temperature controlled frequency source is activated in response to the ambient temperature falling below a predetermined value;
- and
- wherein the predetermined value substantially corresponds to a zero temperature coefficient associated with the temperature controlled frequency source.
3 more elements
A temperature compensated temperature controlled frequency source comprising:
- an OCXO;
- and
- a TCXO ASIC coupled to the OCXO,
- wherein the TCXO ASIC comprises temperature correcting data and is configured to temperature compensate the OCXO on the basis of said temperature correcting data, the temperature correcting data having been derived during a calibration process, said calibration process including activating temperature control of the temperature controlled frequency source;
- wherein heating of the temperature controlled frequency source is activated in response to the ambient temperature falling below a predetermined value;
- and
- wherein the predetermined value substantially corresponds to a zero temperature coefficient associated with the temperature controlled frequency source.
4 more elements
Dependencies are inferred from the claim text.