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(ELEC202)pass_final_ans.pdf
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THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING

Elec 202 Philip Mok
ELECTRONIC CIRCUITS II
Fall 2002 Room 2440
FINAL EXAM (ANSWERS)
(1) (a) VG1 = 2 V, VG2 = 4 V, VS2 = VD1 = 2 V, VD2 = 5 V, ID1 = ID2 = 50 A
(b) Ri = 100 k., Ro = 90.9 k., vo/vi = 4.33 V/V
W5

..
(c) -----= ------
..
L2 2
(2) (a) I=exp(C .
II IIRVT)
o
(b)
II = VT . R

(c)
95.7 A


(3)
(a) Y = A + B . C

(b)
0.465 V

(c)
2.19

(d)
3



(4)
(a) IC1 = IC3 = 0.5 mA

(b)
Rid = 10.4 k., Ricm = 10.1 M.

(c)
Ro = 10 k.

(d)
Ad = 96.15 V/V

(e)
Acm = .0.050 V/V, CMRR = 65.7 dB



(5)
(a) R1 = 19.3 k., R2 = 1.56 k.

(b)
Vicm + = 9 V, Vicm . = .8.92 V

(c)
VO + = 9 V, VO . = .8.22 V

(d)
IO + = unlimited, IO . = 510 mA

(e)
R4/R3 = 1.89




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