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Temperature compensated crystal oscillator

  • US 7,403,078 B2
  • Filed: 12/08/2005
  • Issued: 07/22/2008
  • Est. Priority Date: 12/22/2004
  • Status: Expired due to Fees
First Claim
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1. An integrated circuit for a temperature compensated crystal oscillator having an external crystal, the circuit comprisingan internal temperature sensor,a temperature compensator having one fixed or at least two selectable 3rd and/or 4th and/or 5th and/or higher order temperature compensation functions for at least one specific type of external crystal, andcalibrator circuitry for the temperature compensator, said calibrator circuitry being configured to be connected an external voltage or current source for calibration procedure of the temperature compensator, said external voltage or current source overdriving a respective temperature-dependent voltage or current supplied from said internal temperature sensor to the temperature compensator, whereby enabling the calibration procedure to be performed at one temperature without use of temperature variation.

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