二阶RC低通运放滤波电路，基于multisim9的源代码。-Second-order RC low-pass filter circuit operational amplifier, based on the source code multisim9.

simulink滤波率仿真 二阶和四阶低通滤波-filtering rate simulation simulink second and fourth-order low-pass filter

二阶低通滤波，采用带低通滤波器的增量式PID控制实现上述过程的稳定控制-The second-order low-pass filter, the use of low-pass filter with incremental PID control to achieve the stability of the control process