eci assignmenti (1)
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7/23/2019 ECI AssignmentI (1)
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EC6304 ELECTRONIC CIRCUITS I
Assignment I
---------------------------------------------------------------------------------------------------------------------1. Design the common-base circuit shown in figure such that IEQ= 0.5 mA and VCEQ= V.
Assume transistor !arameters of " = 1#0 and V$E%on& = 0.' V.
Ans
RE= 8.52 KRC= 3.5! K
#. Design the common-base circuit shown in figure( such that IEQ= 0.#5 mA and VCEQ= #V.
)he transistor !arameters of " = '5 and VE$%on& = 0.' V.
Ans
RE= ". 2 KRC= 6.8" K
*. Design a !n! bi!o+ar transistor circuit shown in the figure such that VCEQ= #.5V. ,E= #
is to be used and a transistor with " = /0 and V $E%on& = 0.' V is aai+ab+e.
Ans
R#= !85 K
. or the circuit shown in the figure( determine IE( I$( ICand VCEif " = '5.
I$Q
IEQ
10 2,
E
,$
,C
V
-
= -5VV
3
= 5V
V 3= *V
,E
V -= - *V
,C
,E
# 2
VEC
33
4,$
IC
IE
V$$
= -# V
V 3= 5V
4
VE$
VCC
= VV$$= # V
,C= #.5 2
,$
10 2
IE
,E= 1 2
4
34
3
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EC6304 ELECTRONIC CIRCUITS I
Assignment I
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Ans$ I#= !5.! %A& IC= !.!3 mA& IE= !.!5 mA and 'CE= 6.03'
5. or the circuit shown in figure( assume " = 50 and determine V$$such that IE= #.# mA.
)hen find ICand VEC.
Ans$ IC= 2.!6 mA& '##= 5.06'( 'EC= 2.8'
/. Consider the circuit shown in figure.%a& If " = 100( determine ,$such that VCEQ= #.5V
%b& Determine the minimum and ma6imum a++owed a+ues of " if the 7uiescentco++ector-emitter o+tage is to be in the range 18 VCEQ8 V.
Ans
V$$
,$= 50 2
IE
,E
1 2
- 5V
4
3
VCC
= 5 V
,$ ,
C= # 2
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EC6304 ELECTRONIC CIRCUITS I
Assignment I
---------------------------------------------------------------------------------------------------------------------()* R#= 344 K(+* 40 , , !60
'. or the circuit shown in figure( +et ,1= 5/ ( ,#= 1#.# ( ,C= # ( ,E= 0. (
VCC= 10 V( V$E%on& = 0.' V( " = 100. Determine the change in the Q 9 !oint with a
ariation in " = 50 and 150 when the circuit contains an emitter resistor.
Ans$
50 !00 !50
Q 9 !oint a+ues
I$Q= *5.: ;A #1./ ;A 15.5 ;A
ICQ= 1.0 mA #.1/ mA #.*# mA
VCEQ=5./' V .1 V .0 V
VCC
V< ,
E
ICQ
,C
,1
,#
CC
VECQ
4
3
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EC6304 ELECTRONIC CIRCUITS I
Assignment I
---------------------------------------------------------------------------------------------------------------------. or the circuit in figure( +et VCC= 5V( +et ,1= : ( ,#= #.#5 ( ,C= 1 ( ,E= 0.#
and " = 150.
%a& Determine ,th and Vth.%b& ind I$Q( ICQand VCEQ.
%c& ,e!eat !art %b& if " changes to " = '5.
Ans$ ()*Rt= !.8 K& 't= !' (+ * I#/= ".38 %A& IC/= !.4! mA& and 'CE/= 3.3!' (C * I#/= !.6 %A& IC/= !.32 mA& and 'CE/= 3.4!'
:. In the circuit shown in figure ( +et VCC= 5V( ,C= 1 ( ,E= 0.# and " = 150 andV$E%on& = 0.' V. Design a bias 9 stab+e circuit such that the Q-!oint is in the center of the
+oad +ine.
Ans$
R!= !3 KR2= 3."3 K
VCC
V< ,
E
ICQ
,C
,1
,#
CC
VECQ
4
3
VCC
V< ,
E
ICQ
,C
,1
,#
CC
VECQ
4
3
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EC6304 ELECTRONIC CIRCUITS I
Assignment I
---------------------------------------------------------------------------------------------------------------------10. Design a bias-stab+e !n! transistor as shown in figure. )he transistor Q 9 !oint a+ues are
to be VECQ= 'V( ICQ= 0.5 mA and V,E= 1V. Assume transistor !arameters of " = 0 and
V$E%on& = 0.' V.
Ans$RE= 2 K& R!= !8 K& R2= !62 K& RC= 20 K11. )he !arameters of the circuit shown in figure are V3= 5V( V-= -5V( ,E = 0.5 and ,C
= .5 . )he transistor !arameters are " = 1#0 and VE$ %on&= 0.' V. Design a bias 9
stab+e circuit such that the Q 9 !oint is in the center of the +oad +ine.
Ans$
R!= 6."! KR2= 48.6 K
1#. or the transistor in figure( " = '5. ind the a+ues of the +abe+ed current and o+tage.
V -= - :V
V
3
= :V
V,E
3
V