Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Reexamination Certificate
2008-05-27
2010-06-22
Pascal, Robert (Department: 2817)
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
C331S066000, C331S17700V
Reexamination Certificate
active
07741924
ABSTRACT:
A temperature-compensated crystal oscillator including an oscillation circuit which includes an oscillator, a temperature detector, a voltage variable capacitance element coupled to an oscillation loop of the oscillation circuit, and a temperature compensation circuit. The temperature compensation circuit is configured to apply a compensation voltage to the voltage variable capacitance element to compensate a temperature change in response to temperature data detected by the temperature detector. The temperature compensation circuit has a plurality of correction point data. The respective correction point data is set in advance for each divided temperature zone, selects a first correction point data in a lower temperature zone and a second correction point data in a higher temperature zone, as compared with the detected temperature data, performs an interpolation between the first and second correction point data by a weighted averaged first-order interpolation, and generates the compensation voltage.
REFERENCES:
patent: 5774800 (1998-06-01), Mori
patent: 7-162295 (1995-06-01), None
patent: 2001-28514 (2001-01-01), None
patent: 2002 198736 (2002-07-01), None
Matsui Hiroshi
Takagi Yuichi
Frommer William S.
Frommer & Lawrence & Haug LLP
Goodley James E
Pascal Robert
Presson Thomas F.
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