RC low-pass circuit is the simplest low-pass filter, commonly known as passive low-pass filter.
RC低通电路是最简单的低通滤波器，一般称为无源低通滤波器。
As a new filtering device used in single phase circuit, hybrid type series active power filter is a combined system of shunt passive filter and series active filter.
串联混合型单相电力有源滤波器是串联有源滤波器与并联无源滤波器组合而成的单相电路新型滤波装置。
Noise which comes from both active and passive circuit element in loop filter will deteriorate phase noise of output signal.
环路滤波器中的有源和无源器件均有噪声产生，此类噪声会叠加在输出信号上，从而恶化输出信号的相位噪声。
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