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modes of operation of the transistors

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sagar474

sagar474

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what are the modes of operation of transistors?
 

transistor operates in 3 modes, common base, commen emmiter and commen collector. out of this , we generally use common emmiter mode since it gives sufficient controlled current gain.
 

sorry! my question is in which mode (cut of, active or saturation) the transistors q1 q2 q3 and q4 operate.
 

if Vi=2.5v ,
Q1 Q2 Q3 Q4 active
 

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