Midterm Exam ESE 232 October 8, 2008

Midterm Exam ESE 232

October 8, 2008

Your Name:

Your 10 #:

You need to show all your work in order toget the full credit. There are 4 problems inthis examination.

1.(25 pts) For the two stage amplifier shown below, find the gain va.Vs

Source Stage 1

+ l!.0kDV1

Stage 2

1 kD ~ /2 12kD!

Output

lkD

l0 K----~\0 \4'---t I 00 tc..

\\)$-- l \

2.(25 pts) Assuming that the op amp is ideal, find va. (Hint: Michigan football- Vs

says "when you are in doubt, punt." Or if you don't know what to do, create anextra variable.)

v~-~- G}l

R2'\I@

VS ~ _ ) ~.

, i v~G~ . R1

?+~£~~+ep ~

~. = '1.fs •

t")J~ =- '\J;.. ~ ~

(,t- -+ L~ 1" L=t =_ D ~ 0 + 'V, ;::-Q +~<..\

<VI ( RI -+R 2-) ~ \2-\ lY3 " "" (9

~tef ~ {c.C L CAt (jty,

?tep .~" ice L ~t CD. SIf' ~ w~ clov0\- Kt\OW +lL-

v" It •...&<- "'* ® c~ 0-"" e )(tl-CA.. V CAY I""bIe... '\J3,}

1J;-~~- -=.. 0

iC."'L

~ V\ -\- 0v - L.7: -::::-·0 -::0/ rV~- Uv -t- \Ji - 0R3. R4-

S0 b~:h+ute.~ ~~ 'n @ w;th G) ~~ \

Solve.. ti)y- '1f;; If' iertv\S +.~1h ¥' \::4 -t K>.J~·lt+ f:1 R.}.--+ 12,.he3i~.~E'f"'-- ....•.. --

'1)5> - R, r.~

3.(25 pts) Sketch Vin versus Vout for the circuit shown below (right). For thediode, use the i-v characteristics shown in the dotted box below (left).

r---------------------- IIIIIII

(whereRD = loon) I V.I If)

IIIIII

IIIIIIIIIIIIIIL _

0.5 V

1 kO

+

100('--

'ITo.A-~ 6h" - 1·5 \h~oO{L

-+ I_ 5"

/-~"W'\ t-~ ~ - V- datrlA<t",,~<.

air thL. 0 i'ooLs?. 1 TM d. Iu~.is. 1()!)'\ w~~~ 1h,,"'" 1'Jt~\j

"/ 0 ~\\.

1.5

4.(25 pts). With the Zener diodes (01 and 02) characteristics shown on the below(left), sketch Vout in the function of Vin for the circuit shown below (right). 01 and02 are identical.

--------------,Vinr- --

/0. +c>t-

IIII ~lkDI

/0 i III II+I

-2VIIVo I

02f lkD ~ VoutIlVI

I 01I I

+3..(---~-.~

,,,d L J-~() 6/:-3" /1 3Y:~_IIr-VI·,

~ -----.J.. II-3 v

@ W h.eY'!-]VL... ~ ~ (. 3 \!DI 4- P2- ~~

'Y1r--.

\K

CD W~eY\ 1J:n 7 3 VQ~ 0'" \- 0 I bU2.~k.d~

'11~~

Vn

IV' -L.

~ I/::..i2",1-

. ~I ~

\)0 :;. :; if

CD vJke'1 ~~ L. -3Vt> I 0 Y\ cl.. D L.. b \£.{) k:d.o!.Jr\

'VI'~

p=:::.

- 2-\J t1-t

.-L I"'- ~....t"'

_,v 1 - VOL\t -:: -3'/