Download Numerical Value - Microelectronic Devices and Circuits - Solved Exam and more Exams Microelectronic Circuits in PDF only on Docsity! UNIVERSITY OF CALIFORNIA, BERKELEY
College of Engineering
Department of Electrical Engineering and Computer Sciences
EE 105: Microelectronic Devices and Circuits , Fall 2010
MIDTERM EXAMINATION #2
Time allotted: 60 minutes
NAME: Sede buery
STUDENT ID#:
INSTRUCTIONS:
1. SHOW YOUR WORK. (Make your methods clear to the grader!)
Specially, while using chart, make sure that you indicate how you
have got your numbers. For example, if reading off mobility, clearly
write down what doping density that corresponds to.
2. Clearly mark (underline or box) your answers.
3. Specify the units on answers whenever appropriate.
SCORE: 1 /16
2 114
3 /10
Total 440
For all questions, if not explicitly mentioned, ignore the BJT capacitances.
Prob 1, [16 pts]
Consider the following amplifier:
Yoo Q,
(a) [5 pts] Explain how this amplifier is robust against variation in Rgand R,.
Ye. yy oa bel, —~ Ton
Vip Meg Glad Be Ra -- Lok,
coe f,
er te
Vee ww VAS
ko Unearly depen dual on Ve YO they fer
. ° of BE
epen ent itt hy da pends
{c) [5 pts] Find out the small signal output resistance. You may ignore the early effect.
Re _ ae
eer AA any vo
>
S
Ue
Vy tk shorted aecl
Glin bs open.
2
he) | Re,
{b) [4 pts] Is the following a good cascode? Why or Why not? Assume that gnRe>>1.
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ce < we Peni yr.’
Rout Yet + Om, Yo CRAG)
Vo4 Qe \ ‘
R, t Ka
Hee i
Yoo Q,
Rout ~ © wo pe. SPS
Be bk Gm 7 Ee L
th
het fede HV Stra
Assuming beth Narats ters A
‘,
~ _ .
«Rent = Sn, Ye Reeve, |
Hente tb Us
(c} [4 pts]Find out the output resistance of the folowing cascode. Is it a good cascode? Why or
why not? Assume that parameters for all transistors are identical.
* iva ate.
SOB IG |
é
By yoo Pay ae yey
= Gyn, Tor Mat Ve, |
~ Yoh Ye
Qn, Yor (Mee Oe
ayy Tdentleal.
Prob 3 [10 pts]:
{a} (6 pts] For the following configuration, what is copy: accounting for the base currents?
(b){4 pts] For a bipolar junction transistor, draw ail the relevance capacitances. Also mention their
physical origin.
vivtion Capacdartce.
Emitter unchien:
ak DOM uston Coupee = far
esileckar funcbon: a. yy os .
Cotleet pare Diptitloon eenactben ee . Ca
hue bo caubshate ayaa we ‘ |
Oe Bye Plane = Coe |
