Programmable oscillator circuit and method
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United States of America Patent
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-
Dec 16, 2003
Grant Date -
Aug 30, 2001
app pub date -
Jan 5, 2001
filing date -
Feb 5, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A programmable crystal oscillator is provided having a memory for storing frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to a crystal to thereby adjust the crystal source frequency. Additional parameters are used to program the output frequency of a phase locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The oscillators can be manufactured as generic programmable crystal oscillators without regard for output frequency and then quickly programmed to produce customer-specified output frequencies with a high degree of accuracy.
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