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Frequency synthesizer having means for suppressing frequency instability caused by intermittent PLL operation
Frequency synthesizer having means for suppressing frequency instability caused by intermittent PLL operation
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机译:频率合成器,具有抑制由间歇性PLL操作引起的频率不稳定性的装置
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摘要
Frequency instability in a frequency synthesizer having a PLL circuit (3, 4, 5, 6, 7) operated intermittently to save its power consumption has been avoided by providing a means to suppress such instability. The instability has been found to be caused by phase uncertainty between reference frequency (fr) and output frequency (fout) at a time when the PLL is switched on. Therefore, a means (S2, S3) to equalize the phase of both frequencies has been provided. The new frequency synthesizer is stable enough for application to a mobile transmission system.
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