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... in CE configure...

as Vo=Vcc-Ic Rc now as Vcc is consistent. v can say Vo is directly proportional 2 (-Ic Rc) so now when the base voltage is increased Ib will inc. thus, Ic will inc. cuz Ic=beta Ib thus Ic Rc drop increases... as Vo is prop 2 -Ic Rc thus, Vo will decrease...thus d curve for d +ve half cycle in which Ib is increasing drawn in 180 deg phase showing Vo is dec. n vice versa 4 -ve half cycle...

now in CC...

as d o/p is taken from emitter... Vo= Ie Re so der's no -ve sign..n for d +ve cycle Ie will increase leakage current) as der's no-ve sign it'll b in phase wid i/p..hence no phase shift as leakage current doesn't increase so much thus, dis o/p voltage Ie Re doesnt inc much thus, d o/p doesn't amplify much thus dis configure known as emiter follower...

now in CB,...

d I/P is applied at emitter n o/p is taken from collector... so, 4 d +ve half cycle d Eb junc will b more FB thus causing incr. in Ib n thus, in Ic... so inc. in Ic causes inc. in o/p voltage..n during -ve half cycle d junc will b less FB so o/p voltage will b decreasing..hence der's no phase shift...

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