日志
PLL学习笔记3-filter
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lead vs lag filter
对于filter的设计，主要要分析其零极点对loop gain 的稳定性的影响。
很多时候，有些学者会称lead or lag filter or lead lag filter。 是什么意思呢？
in frequency response design, the phase-lead or lead filter adds positive phase to the system over the specified frequency range.
The lag filter adds negative phase to the system over the specified frequency range.
lead-lag filter combines the effects of a lead filter with those of a lag filter. the result is a system with improved transient response, stability and steady-state error.
如何看你的filter是什么类型，主要取决于它对phase response产生的影响。
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