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[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.
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I'age 1