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Unformatted text preview: ECE 110 Professors Brunet and Trick March 14, 2005 HOUR EXAMINATION #2 Last Name (use capital letters): First Name (use capital letters): _ ,“ t
Signature: / at i ‘ Circle your section: AL1(lpm)Trick BL1(noon)Brunet A. Write or print clearly. Answer each problem on the exam itself. If you
need extra paper, there is an extra sheet at the end of this exam. Clearly identify the problem number on any additional pages. The Boolean Algebra
identities are also given at the end of the exam. ' — B. In order to receive partial or full credit, you must show all your work,
e.g., your solution process, the equation(s) that you use, the values of the variables used in the equation(s), etc. You must also include the unit of
measurement in each answer. Students caught cheating on this exam will earn a grade of F for the penalties may include suspension and/or dismissal
from the university. Problem 1 (20 points) Alex is using a, 15 V voltage source and a RIOOMA voltage regulator with a 5 V, 2 W Zener
diode to power the XPSOO circuit which is rated at 5 V and 200 mA.
Unfortunately, Alex finds that under maximum load conditions VL = 3 V.
Advise Alex how he can modify the
RIOOMA circuit so that it will supply
a constant 5 V to the XPSOO circuit over the current range 0 5 IL < 200 Problem 2 (20 points) 3 V Assume:
2 k9 Show 3L1 of
+ B = 100 your work
VIN VOUT VON = VBEON = 0.7 V for all parts.
VCESAT = 0.2 V VIN: 1.5 +0.5 sin (ot a) (2 pts.) Give the range of values for VIN: S VIN .<_ b) (pm) For the given VIN explore all possible states of the BJT in the circuit. If a state is
possible, give the range of VIN values for that state (if not, check “not possible”). IE
I:
E Idlwx : "gyiOKZl/z: 1‘6 3 MO ll
3R. :2 :15 c) (9pm.) Compute the values of i3, ic, and VOUT when the BJT is active and for the extreme
values of VIN (i.e., for VMIN and VMAX) found in b). c ' ‘~
g 37%?) / (0' B Problem 3 (20 points) a) Convert the Boolean function F = KEY 0 ﬁ to a SOP
used in the conversion. ‘ t’ tﬁ"“ :Da/b/TKMS [~— :_ form. State the identity or method you b) Complete the truth table for the
Boolean function in part 3a). We) . Wm:
@i" 1:: I 35%?“
(fa/L73; xwdﬁy ‘0 c) For the given truth table, write a _’
Boolean function for it i anomca ’ M Z
0 0 O 1
SOP form. x 7
ﬂ.‘ ' ' O O 1 __. 0
[’;29—+XV*+%R'010 0
.  a a _ \~~~—/ o 1 1 0
gig) if ' i100 1X5. 1 1 0 O
1 1 1 0
d) Find the ptimal S P Boolean function for the truth table in SC).
, HINT The imal corresponding circuit has 3 gates and F: [7’th +X'7g ix??? ,_ ._
=QZ+><M7§ +~><'\7(:+&> = 7’32 “(Y Problem 4 (20 points) a) (10 pts.) Complete the truth table for the CMOS circuit below; A low voltage is a logic “0” and
a high voltage is a logic “1.” b) (10 pts.) For the given truth table, draw the CMOS circuit that implements the logic function
specified by the truth table below. Problem 5 (20 points) a) (12 pts.) Fill in the truth tables for the circuit below. Show your work. a
X , b
Y c
(CA) d
e
f
a l l g > ’
3:13;“ ay 3 display 4
«ﬁne :e:$ 211:6: ' Q~ 2
V  D aw what is displayed: :3 :I Q ‘3:
a .
b ‘_‘
C
d
6
f
g 7segment
display ...
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 Spring '08
 HAKEN

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