Analogue frequency leading USES classic crystal filter group, it has many shorts, such as a great deal components, high cost and large bulk.
模拟式频率引导采用经典的晶体滤波器组，其数量大、成本高、重量体积大。
Digital filter can be divided into analogue filter with two digital filter.
数字滤波器可分为模拟滤波器与数字滤波器两种。
The variable impedance scaling method for design of SCN has been improved in the Paper, the resulting is that the analogue filter can be realized by Passive SCN.
改进了目前采用的开关电容网络阻抗标度设计法，使模拟滤波器可以用无源开关电容网络完成。
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