Question

An increase in the base recombination of a BJT will increase 

(a) The common emitter dc current gain β

b) The breakdown voltage BV_CEO 

(c) The unity – gain cut – off frequency f_T 

(d) The transconductance g_m

Answer 1

Correct option (b) The breakdown voltage BV_CEO

Explanation:

The breakdown voltage BV_CEO is related to BV_CBO through the following

BV_CEO = BV_CEO/(β)^1/n

As recombination increases, the base current (I_B) will increase 

Since     I_C = I_E- I_B 

So, I_C decreases

Thus,β decreases

Hence 1 /β increases

Hence, BV_CEO increases