A (BJT) emits a current of 1mA, and has emitter efficiency of 0.99. The base transport factor is 0.994 and a depletion layer recombination factor is 0.997. For the BJT calculate the following −

The transport factor

The rewritten transport factor is given by −

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

Substituting the values, we get

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

The current gain

Current gain is given by −

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

Substituting the values, we get

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

The collector current

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

The base current

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