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在计算晶体管放大系数时,晶体管用等效四端网络代替,它的全部参数认为是不变的.而这只有在电流和电压较小变化的范围内才是正确的.为要考虑四端网络参数的变化,这种变化与由工作点位置确定的电压有关,在计算共发射极放大器的放大系数时,应当采用晶体管的近似统计特性,在ik—uk的坐标中,集电极特性曲线近似于直线,与此对应的方程为
In calculating the transistor amplification factor, the transistor is replaced by an equivalent four-terminal network, and all its parameters are considered constant, which is only correct for small changes in current and voltage. To consider the four-terminal network This change is related to the voltage determined by the location of the operating point. When calculating the amplification factor of the common emitter amplifier, the approximate statistical properties of the transistor should be used. In the ik-uk coordinates, the collector characteristic curve approximates Straight line, and the corresponding equation is