Method and apparatus for a crystal oscillator to achieve fast start-up time, low power and frequency calibration
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United States of America Patent
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Mar 25, 2008
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N/A
app pub date -
Mar 31, 2005
filing date -
Mar 31, 2005
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Abstract
One embodiment of the present invention includes a frequency generation circuit including a control module, an oscillator circuit coupled to the control module, the oscillator circuit having a start-up time defined by the time required to reach a desired frequency. The oscillator circuit includes an amplifier having an input and an output and being programmably-alterable by the control module, a first capacitor coupled to the input of the amplifier and being programmably-alterable, in capacitance, by the control module, a second capacitor coupled to the output of the amplifier, a crystal resonator coupled to the first and second capacitors for generating an output signal having a desired frequency, wherein fast start-up time is achieved.
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