This paper gives the design and experimental results of low noise NPLL frequency synthesizer and concludes that the passive loop filter is more suitable for low noise design than active loop filter.
介绍低相噪NPLL 频率综合器的设计及实验结果。提出用无源环路滤波器比用有源环路滤波器更好，可获得低相噪设计。
Active band-pass filter is a important section of pulse width modulated rebalance loop.
有源带通滤波器是脉冲调宽再平衡回路的一个重要部分。
Noise which comes from both active and passive circuit element in loop filter will deteriorate phase noise of output signal.
环路滤波器中的有源和无源器件均有噪声产生，此类噪声会叠加在输出信号上，从而恶化输出信号的相位噪声。
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