Temperature compensated crystal oscillator
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United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
May 23, 1996
filing date -
May 25, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a digital temperature compensated crystal oscillator, ADC circuit and DAC circuit are combined into a data conversion circuit which comprises a first section for DA conversion, a second section for converting an analog temperature voltage signal into a digital form in cooperation with the first section, and a third section for supplementing the DA conversion of the first section and thereby generating an analog control voltage for a VCO from a digital temperature compensation data. There is further provided a switch circuit for connecting the output of the first section to either of the second and third section.
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