No Warmup Crystal Oscillator

David H. Phillips

Abstract:	During warmup, crystal oscillators often show a frequency offset as large as 1 part in lo5. If timing information is transferred to the oscillator and then the oscillator is allowed to warmup, a timing error greater than 1 millisecond will occur. For many applications, it is unsuitable to wait for the oscillator to warmup. For medium accuracy timing requirements where overall accuracies in the order of 1 millisecond are required, a no warmup crystal concept has been developed. The concept utilizes two crystal oscillators, which are used sequentially to avoid using a crystal oscillator for timing during the trauma of warmup. One oscillator may be a TCXO which preserves timing information during the warmup of the second crystal oscillator, which has a much higher frequency accuracy once warmed up. This paper will show the accuracy achieved with practical TCXOs at initial start over a range of temperatures. A second design utilizing two oven controlled oscillators will also be discussed.
Published in:	Proceedings of the 13th Annual Precise Time and Time Interval Systems and Applications Meeting December 1 - 3, 1981 Naval Research Laboratory Washington, DC
Pages:	831 - 849
Cite this article:	Phillips, David H., "No Warmup Crystal Oscillator," Proceedings of the 13th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, DC, December 1981, pp. 831-849.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In

ION Technical Content