3、在filter Attributes中设置滤波器的阶数（Order）、通频带频率（Passband frequency）； 4、在Implementation中选择有源滤波器（active ）、无源滤波器（passive）和数字滤波器（Digital）；
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flat-top passband frequency response 平顶通带频响
Passband Center Frequency 通带中心频率
lower passband edge frequency 下通带频率
upper passband edge frequency 上通带频率
frequency passband 射频通带
nominal passband center frequency 额定带通中心频率
Two parameters are used to specify the characteristics of a BPF: passband centre frequency and resonance bandwidth.
带通滤波器的特性通过两个参数表示：带通中心频率和共鸣带宽。
Due to the frequency pulling of FLL, the passband of the filter in PLL can be made very narrow to suppress the noise, and the PLL can lock carrier's phase with high accuracy.
由于有锁频环的频率牵引，锁相环路滤波器可以设计得很窄，具有很好的抑噪性能，满足精确跟踪载波相位的要求。
In this paper, a novel design method of a passband edge frequency continuous adjustable FIR filter is presented.
提出了一种通带截止频率连续可调的低通滤波器的新的设计方法。
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