Temperature compensation of a crystal reference using direct dig

Details Temperature compensation of a crystal reference using direct dig Temperature compensation of a crystal reference using direct dig

1992-01-31

1993-06-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 25, 331158, 331176, H03L 102, H03L 706

Patent

active

052163890

ABSTRACT:
Certain operational characteristics of a crystal (104) are measured during a testing and grading process. Once determined, information representing these operational characteristics are stored in memory (120) and utilized by a controller (122) to increment a phase increment register (114) upon determining the crystals ambient temperature via a temperature sensing circuit (124). The value stored in the phase increment register (114) is then sent to a phase accumulator (116) where successive phase increments are summed together. This summed value is in turn sent to a sine lookup table (118) where the instantaneous phase value is converted into sine amplitude. Finally, a digital to analog converter (126) converts the amplitude bit stream into an analog signal for use as a reference oscillator frequency having extremely high frequency resolution. The above mentioned process is repeated every clock cycle until a complete sine wave is produced at which point the phase accumulator is reset to zero and the process begins again.

REFERENCES:
patent: 4427952 (1984-01-01), Zumsteg
patent: 4454483 (1984-06-01), Baylor
patent: 4905177 (1990-02-01), Weaver, Jr. et al.
patent: 4965533 (1990-10-01), Gilmore
patent: 4967165 (1990-10-01), Lee et al.
patent: 5041799 (1991-08-01), Pirez
"Q2334 Dual Direct Digital Synthesizer, Technical Data Sheet" by Qualcomm Inc., Jun. 1991 pp. 1-35.

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