Self-calibrating temperature-compensated frequency source
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United States of America Patent
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-
Dec 15, 1992
Grant Date -
N/A
app pub date -
Feb 21, 1992
filing date -
Jun 22, 1989
priority date (Note) -
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status (Latency Note)
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Abstract
A frequency source (1) in, for example, a remote unit in a mobile communications system, is controlled to maintain a stable frequency signal. In normal operation, the frequency source (1) is frequency locked to an external reference frequency (10). A temperature detecting device (2) monitors the temperature of the frequency source, and information relating to temperature is stored in a storage device (7) together with information relating to control signals (6) applied to the frequency source (1). In the absence of the reference frequency (10), the temperature of the frequency source (1) is detected and the stored information is used to generate a control signal (6) to control the output frequency of the frequency source (1) in accordance with the detected temperature.
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