Part - ECED Mansoura « Academic Site · f, f lrnsorrr.a Ilnivcro..ilv ffar:ully of lin$irrrrelirr...

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t1] The transistor amplifier in Fig.1 is biased with a current source l and has a

very high /.(a) Find the dc voltage at the collector, V6'.

(b) Find the valr"re of gn.

(c) Replace the transistor witlr the sirnplified hybrid-a model. Flence find the

voltage gain vrlvp

[2] In the circuit of Irig.2, The transistorp is 100.

(a) Find the value of Rs to establish a dc emitter current of abor-rt 0.5 rnA.

(b) Find Rc to establish a dc collector voltage of about 5 V.

(c) For R': l0 kf) and the transistor ro : 200 kf), draw the small-signal

eqllivalent circuit of the arnplifier and cletermine its overall voltage gain.

[3] For the comtron-elllitter arnplifier shown in Fig.3, Iet V1'c': 9 V, Rt : 27

kfj, Rz= l5 kQ, Rs : 1.2 l(fr, and Rc : 2.2 kQ. The transistor has p: 100

ancl Va - 100 V. l'he amplifier operates between a source fbr which Rsi-u :

l0 kfJ and a load of 2 kfl.

(a) Calculate the dc bias current Ip.

(b) Fincl the valtte of R;,,.

(c) Find the voltage gain v,/v,is.

(d) Find the cun'ent gain i"/i1.

[a] The BJT in the circuit of Fig.4 has B: I00. '

(a) Find the dc collector current and the dc voltage at tlre collector.

(b) Deterrnine the voltage gain v,,/v*;-n.

(c) Suggest a way to increase the voltage gain without affecting the Q point

of the transistor.

Page 1

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Part - ECED Mansoura « Academic Site · f, f lrnsorrr.a Ilnivcro..ilv ffar:ully of lin$irrrrelirr...

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