TRANSISTOR BIASING

• The emitter base junction is forward biased and the collector base junction is reverse biased.

• Due to the forward bias on the emitter base junction, an emitter current flows through the base into the collector.

• Though   the   collector-base   junction   is   reverse   biased,   almost   the   entire emitter current flows through the collector circuit.

• The  forward  biasing  of emitter-base junction  allows  a low  resistance  for  the emitter  circuit  and  reverse  biasing  of  collector-base  junction  provides  high resistance in the collector circuit.

• In  a  transistor,  a weak  signal is  introduced  in  low resistance  circuit  and  the output  is  taken  from  the  high  resistance  circuit.  So  a  transistor  transfers signals from low to high resistance.