Temperature compensated crystal oscillator

Details Temperature compensated crystal oscillator Temperature compensated crystal oscillator

2005-12-08

2008-07-22

Pascal, Robert J. (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S066000, C331S158000

Reexamination Certificate

active

07403078

ABSTRACT:
The present invention relates to an integrated circuit for a temperature compensated crystal oscillator having an external crystal. The integrated circuit comprises a temperature compensation having one fixed or at least two selectable 3rdand/or 4thand/or 5thand/or higher order temperature compensation functions for at least one specific type of external crystal. The temperature compensation can be calibrated at one temperature, in other words without use of temperature variation, by means of an external voltage or current source overdriving a respective temperature-dependent voltage or current supplied from an internal temperature sensor to the temperature compensation.

REFERENCES:
patent: 5757244 (1998-05-01), Nonaka et al.
patent: 5986515 (1999-11-01), Sakurai
patent: 6476682 (2002-11-01), Cole et al.

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