Experimental results indicate the largest upper cut-off frequency of human ECG 12 leads is about 30 Hz thus a low-pass circuit system can satisfy the requirement of transmission of ECG without wave distortion .

实验结果表明，人体十二导联心电信息 频谱 频率 上限的最大 值在工程上可以认为是在30Hz左右，因而，高端 截止 频率为30Hz的特性良好的低通电路系统即可满足不失真地传输心电信号。

With the increase of plasma density dispersion curve is shifted upward significantly . Because the shift speed of the lower cutoff frequency for TM mode is greater than that of the upper cut-off frequency bandpass frequency range reduced gradually and the dispersion curves become flattened . 4 .

随着等离子体密度的增加色散曲线明显上移，由于TM模式的下截止频率上移的速度大于 上 截止 频率上移的速度，导致通带的频率范围减小，色散曲线变平坦。

For the first time the low-frequency characteristic optimization model of T-integrator is set up . The conditionality relation between the upper cut-off frequency limit and the maximum peak instantaneous error of T-integrator is analyzed by simulation and experiment .

建立了T型积分器的低频动态特性优化模型，通过仿真与试验分析了T型积分器的 上限 截止 频率与最大峰值瞬时误差之间的制约关系。

In this paper the CE-CB amplifier is analyzed with high frequency response in detail the relation of the upper cut-off frequency and common-base amplifier upper cut-off frequency of this amplifier is obtained and characteristic of this amplifier is also analyzed .

该文对常用的共射&共基放大电路进行了高频响应的详细分析，给出了此电路的 上限 截止 频率与共基放大电路上限截止频率的关系，并分析了此电路的特点。