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A novel microcomputer temperature-compensating method for an overtone crystal oscillator.

MinQiang Li1, XianHe Huang, Feng Tan

  • 1University of Electronic Science and Technology of China.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|January 21, 2006
PubMed
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A new microcomputer temperature-compensating method for overtone crystal oscillators (MCOXO) improves frequency stability. This novel approach uses a ceramic oscillator to compensate for deviations, enhancing performance across various oscillator types.

Area of Science:

  • Electrical Engineering
  • Electronics
  • Signal Processing

Background:

  • Traditional overtone crystal oscillator (OXO) compensation methods often lead to degraded frequency stability and increased phase noise.
  • Existing techniques like adding inductance or frequency multiplication have inherent limitations.

Purpose of the Study:

  • To introduce a novel microcomputer-controlled temperature-compensating method for overtone crystal oscillators (MCOXO).
  • To enhance the frequency stability and phase noise performance of OXOs.
  • To develop a versatile compensation technique applicable to a wide range of oscillators.

Main Methods:

  • A ceramic oscillator's output frequency is mixed with the OXO's output frequency.
  • A crystal filter is employed to suppress unwanted mixing products.

Related Experiment Videos

  • A microcomputer controls a switch capacitance array connected to the ceramic oscillator for precise frequency deviation compensation.

    • Main Results:

    • The proposed method effectively compensates for frequency deviations without degrading stability or phase noise.
    • Experimental results demonstrate a frequency-temperature stability of less than or equal to +/-2 x 10(-6) for a 100 MHz 5th overtone MCOXO over 0-70 degrees C.
    • The technique shows broad applicability to various oscillator types and wide frequency ranges.

    Conclusions:

    • The novel microcomputer-controlled compensation method offers a superior alternative to traditional techniques for overtone crystal oscillators.
    • This approach achieves excellent frequency-temperature stability and is adaptable to diverse oscillator applications.
    • The MCOXO method overcomes limitations of prior compensation strategies, providing enhanced performance and wider applicability.