Frequency modification circuitry for use in radio-frequency communication apparatus and associated methods
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United States of America Patent
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Apr 3, 2007
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app pub date -
Dec 23, 2005
filing date -
May 29, 1998
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Abstract
Frequency modification circuitry may be employed as part of a crystal oscillator circuit to generate a reference signal with adjustable frequency. The frequency modification circuitry may be implemented as part of a crystal oscillator circuit that includes digitally controlled crystal oscillator ('DCXO') circuitry and a crystal. The frequency modification circuitry may adjust the frequency of the reference signal in response to one or more frequency control signals. In one example, the frequency modification circuitry may include variable capacitors such as one or more continuously variable and/or discretely variable capacitors for providing coarse and/or fine adjustment of the reference signal frequency.
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