The SC filter is insensitive to parasitic capacitance implemented by a simple circuit in the way of combining advance mutation of parasitic resistance and SC negative resistance.

为了获得电容最佳值，提出了一种简单的最优化方法；并采用寄生电阻预畸变与SC负电阻相结合的办法，设计的SC滤波器对寄生电容不灵敏，且电路简单。

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Aiming at actual instance that the frequency of electric network is waving, based on twin-T resistance-capacitance active-trap filter, a trap filter which can filter the power interference between 49.

针对电网频率波动的实际情况，基于双t型阻容有源陷波电路，设计了可以滤除频带在49。

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