00:01
Hello students here we have to discuss about the bipolar junction transistor that is bjt.
00:07
So it is a three terminal semiconductor device that can amplify a switched electronic signal.
00:13
So here we have to discuss about the gain.
00:17
So the gain of bjt is a ratio of the output current to the input current.
00:26
So we can write efficiency equal to output current divided by input current.
00:39
So here in the normal active mode of operation the emitter base junction is forward biased and the base collector junction is reverse biased.
00:49
So it will cause under the situation large number of minority carriers to inject from the emitter to base large number of minority carriers inject from injected from the emitter into base emitter into base.
01:30
Then we have to discuss about its current gain.
01:36
So we can write on the current gain as current gain beta equal to dn lb divided by db wb.
01:59
So here dn is the diffusion constant and dn diffusion constant and lb is base width and db is the diffusion constant of the minority carriers db diffusion constant of minority carriers in collector region and wb is the width of the collector region width of collector region...