首页>
外国专利>
ACCUMULATOR-TYPE FRACTIONAL N-PLL SYNTHESIZER AND CONTROL METHOD THEREOF
ACCUMULATOR-TYPE FRACTIONAL N-PLL SYNTHESIZER AND CONTROL METHOD THEREOF
展开▼
机译:累加器式分数阶n-PLL合成器及其控制方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
There are provided an accumulator-type fractional N-PLL synthesizer for suppressing the fractional spurious caused by periodically switching a frequency division number of a fractional frequency divider, and a control method thereof. In an accumulator-type fractional N-PLL synthesizer (100), a pulse signal proportional to a fractional phase error occurring between a reference signal and an output signal of a fractional divider (112) for feeding back an output of a VCO (115) of an output stage to a preceding stage is generated using an error signal from an accumulator (120). Through the use of the pulse signal, pulse widths of a UP signal and a DN signal output from a phase detector (140) are controlled so as to reduce a fractional phase error occurring between the UP signal and the DN signal. Thus, the fractional spurious caused by periodically switching the frequency division number of the fractional divider (112) is suppressed.
展开▼