【摘要】 从半导体器件的基本方程出发，采用数值模拟方法，按照电流增益截止频率（ｆＴ）的定义，模拟计算了ＡｌＧａＡｓ／ＧａＡｓＨＢＴ的ｆＴ，以及偏置电压和输入信号幅值对ｆＴ的影响，给出了电流放大系数随频变化的复平面图。更多还原

【Abstract】 According to the definition of current gain cutoff frequency (f_T), the f_T for an AlGaAs/GaAs HBT was simulated employing the semiconductor device basic equations and numerical method.The physical process of the current amplification was discussed.The effects of various DC bias voltage and the amplitude of the input signal on f_T were simulated.The complex plane chart of the current gain was presented.更多还原