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Department of Electrical Engineering, IIT Kanpur ESc 201:
Introduction to Electronics
23 rd September, 2013
Home Assignment 7[Note: DC Voltage = V I (all capital letters);
ac Voltage = v i(all small letters); Net voltage = V i (base is in
capital
and subscript is in small letter; device (A, X, Y or Z) is
always in capital letter ]
1. Determine the ac voltage gain of the amplifier Aas shown in
Fig. 1(a ) using thetransistor model shown in Fig. 1(b) and Fig.
1(c) as dotted region .Assume that the deviceA is biased
properly.
Fig. 1(a)
Fig. 1(b) Fig. 1(c)
2. Carry out DC and AC analysis of the amplifier circuit,with
amplifier X, whose devicecharacteristics are shown in Fig. 2 .
Also, sketch V iX, V oXand v sfor )sin(2.0 t v S = .
Fig. 2
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Department of Electrical Engineering, IIT Kanpur ESc 201:
Introduction to Electronics
3. Determine appropriate Q point (DC value of V iYand VoY) so
that amplifier shown in Fig.3 would properly amplify an input
voltage of )sin(2.0 t v S = . Also, determineminimum supply voltage
VCC for which the amplifier would work properly.
Fig. 3
4. Carry out DC and AC analysis of the amplifier circuit shown
in Fig. 4 to determine biasor Q point (DC value of IoZ and VoZ )
and ac voltage gain .
Fig.4
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2 Ko-
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\rt = - o'osVo \* cte, Q ar n
s^r- o'
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-$ornr @
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:.
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tr.
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> o.t (vf\ -
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= 2ox
La
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P-A
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ru
I
g 1.6.o
1.7+0.2=1.9
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ontq contSiC4edo
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t alr .,rt-
1
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Ac Onatl^na:
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z I.5V
6in Ccol) > t,5 V
r z,';
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toY =
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+.:\-)
=Vry * u;y
+a,L
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IoY
Vr\ ,l'sv 1'?v
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P-sryt .
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aJ
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t
= 3+q',= I v i ' \i
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8-',A,nFliHe* l
i'' :&-
::. :
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-l=ln,
= X,n
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;
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\ (Yr- Y)
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Now rhe o,cruat
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a
-a
1}
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f -. lo00Toz5- roooIY--_.vv
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%z = 4'0.''
.=l s]-1.5J*i"5--
5Kn-
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P-Lkc Arra.tgriA: -
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ond dc AILL'( c-e)>
afiut Ahorting eaTacetov,{
Ac marril
-4 ttfuzl
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c*cuiFL6,
ugz ='o
lK ll o,|K= 9o.9 .rr-tox r trK
= 5 K'tu
Fxorn
Ac
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\9"- VLL- S
U,
ax:.d vo =EZ;'- 1o,1 x $lz
votfqSe ?ain , d u-= ALvi7-
9a,Q tia
