被动的方法具体有：滤波、屏蔽、接地、去耦、旁路等。
Passive measure include: filter, Fielding, earthing, bypass, decoupling etc.
在硬件电路设计中，大量采用了性能较好的去耦和旁路电容来加强系统的稳定性，并为了调试方便设计了JTAG接口。
To enhance the stability of the system, design a lot of decoupling and bypass capacitors in hardware circuit. And the JTAG debug interface is designed for convenient debugging.
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