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Slrr.r.t (l)

[1] Assui,ing the transistor in the circuit shown in F-ig.I

(a) Detennine rr.

(b) Determine rc.

(c) Define the relation between rnlncl r,.

(d) Based on the resistances r,T and re, constrLrct the equivalent srnall-signal

circuit rnodels (n-,rodel and J'-model) for the BJT.

12] At what collector current will rn: l0 KO lor a BJ I with /) : 75. Derermine

re.

[3] A transistor with /t : 120 biased to operate at a clc collector cunent of I .?-

mA.

(a) Determine gn,, r,.and r..

(b) Repeat fbr a bias collector current of 120 1tA.

14) A designer wishe's to create a BJI' amprifier with a g,,, 01.50 mA/v and a

base input resistance of 2000 C) or more.

(a) What is the minirnum p he can tolerate fbr the transistor used?

(b) What emitter-bias current shoulcl he choose?

[5 ] Analyze the transistor aurplifier shown in Fig.2 to derennipe its voltage gain.

Assume f : 100.

Vcc = +10 V

/lc : 3 kf)

rt.

vre

I'age 1

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Pnr$ qtrp - ECED Mansoura · (lorrrrrrrrrrir.aliorr lingiilrc,r,r.irrgi t)e;r:rrlrnr.rrl ilI:rnsour.r f!rrivor.sil.r. Iracrrll.t' of Drrgiirreer.irrg D-or.onrl Yelr (lornrn rrnie:rl