OVEN CONTROLLED CRYSTAL OSCILLATOR
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United States of America Patent
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Issued Date -
Feb 26, 2015
app pub date -
Jun 18, 2014
filing date -
Aug 23, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An oven controlled crystal oscillator (OCXO) is provided for improving temperature characteristics of a frequency. In the OCXO, a thermostatic oven 5 (20a) is provided in a thermostatic oven 9 (20b), a temperature control circuit 13 controls a temperature in the thermostatic oven 9 based on a temperature detected by a temperature sensing element 10, a first resonator 1 and a second resonator 2 are provided in the thermostatic oven 5, a temperature control circuit 8 controls the temperature based on an oscillation frequency difference between the two resonators, and especially, the temperature control circuit 13 controls the temperature to be within the temperature region where the oscillation frequency difference between the first resonator 1 and the second resonator 2 corresponds with the resonator temperature in a one-to-one manner, and the temperature gradient is either in a positive direction or in a negative direction.
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