Field calibration of a digitally compensated crystal oscillator

Oscillators – With frequency calibration or testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

331158, 331176, H03L 100

Patent

active

053920058

ABSTRACT:
Solving the aging problem of crystal oscillators by doing field recalibration. The solution is to utilize an accurate external reference signal to determine when the frequency of the digital temperature compensated crystal oscillator (DTCXO) has drifted from the reference signal in excess of a specification. When this occurs, the DTCXO has used its internal compensation values to correct its output hence the difference between the external reference signal and the frequency of the DTCXO in excess of the specification is due to aging. A new compensation value for the present temperature is calculated using the reference signal. Using the well known fact that the temperature aging uniformly shifts the frequency over the temperature range, a controller utilizes the difference between the new compensation value and the stored compensation value for the present temperature to shift the entire set of compensation values to compensate for the aging effect.

REFERENCES:
patent: 4746879 (1988-05-01), Ma et al.
patent: 4922212 (1990-05-01), Roberts et al.
patent: 4930142 (1990-05-01), Whiting et al.
patent: 5041798 (1991-08-01), Moorman et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Field calibration of a digitally compensated crystal oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Field calibration of a digitally compensated crystal oscillator , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Field calibration of a digitally compensated crystal oscillator will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1933671

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.