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Frequency switching method, voltage controlled oscillator using same and receiver for spread spectrum communication using same
Frequency switching method, voltage controlled oscillator using same and receiver for spread spectrum communication using same
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机译:频率切换方法,使用其的压控振荡器和使用其的扩频通信接收机
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摘要
A crystal oscillator which configures a voltage controlled oscillator having a variable oscillation frequency is also used as a crystal oscillator of an oscillator for generating a fixed frequency. Control input is integrated by an integrator, a phase of a frequency-divided signal obtained by dividing a fixed clock by a frequency divider is controlled by the integrated value to vary a frequency. Every time a phase-shifting amount at the time becomes to correspond to one clock, a frequency division ratio at dividing the clock is changed from a predetermined frequency division ratio for one time of frequency division to absorb the phase shifting amount for one clock, thereby operating as a voltage controlled oscillator. Thus, the voltage controlled oscillator having the frequency accuracy of a fixed clock is realized.
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