功率半导体器件解题示例

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一个(BJT)发射电流为1mA，发射效率为0.99。基区传输系数为0.994，耗尽层复合系数为0.997。计算以下BJT参数：

传输系数

改写的传输系数由下式给出：

$$\alpha =\gamma _{E}\times \alpha _{T}\times \delta _{r}$$

代入数值，得到

$$\alpha =0.99\times 0.994\times 0.997=0.981$$

电流增益

电流增益由下式给出：

$$\beta =\frac{I_{C}}{I_{B}}=\frac{\alpha }{1-\alpha }$$

代入数值，得到

$$\beta =\frac{0.981}{1-0.981}=51.6$$

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集电极电流

$$I_{C}=\alpha \times I_{E}=0.981\times 1=0.981mA$$

基极电流

$$I_{B}=I_{E}-I_{C}=1-0.981=19\mu A$$