1 b

Student solution work sheet, ECE 137A. Version B

Wednesday March 18, 2020, Noon - 2 p.m.

There are 2 different versions of the exam: be sure to work the

exam assigned to you. You will otherwise not receive credit

Name: __________________________

Closed Book Exam:

Class Crib-Sheet and 2 pages (4 surfaces) of student notes permitted

You will start working this exam no earlier than noon.

You must finish working on this exam no later than 3PM.

You must either

upload this exam to www.ece.ucsb.edu/rodwellfinals ,no later than 4:00PM

or place a paper copy in the class homework box no later than 4:00PM

You may print this document and write on it, or you may work on blank paper.

If you work on blank paper, you must clearly label which page corresponds

to each problem, and you must circle each answer.

Use any and all reasonable approximations, after stating & justifying them. Show your

work: Full credit will not be given for correct answers if supporting work is missing.

Good luck

Part Points

Received

Points

Possible

Part Points

Received

Points

Possible

1a 2a 15

1b 2b 10

1c 2c 7

1d total

1e

1f

2 b

Work this exam if your name is on this list:

Student Last Student First Middle

ABULABAN RAMI OMAR

ALCARAZ HAYDEN

BAO ISAAC

BEHZADI FRANK FARNOUD

Bhangui Anisha

CAO XIANGYUE

CEBALLOS AURELIANO VALDEZ JR

DE LA O KYLE ETHAN

DEL ROSARIO JACOB

ENGER BOB DONALD III

GAO HUAYANG

Gasparyan Arno

GENG CATHY

GEPIGON MARC VERGARA

Hernandez Derek Flores

JIANG SHUHE

LONGTIN JOHN PHOENIX

LUO JINHUI MCVEIGH-DIPESO FRANCIS JAMES

MIR NAVID DANIEL

NARIO ARISTEO LUBID

NGO JASON A

NIKOLAEV LAXUS

Patig Alice

RIVERA ALEX RAFAEL

ROGERS DAKOTA CARNOY

SHOENBACH DREW CAMERON

SUZUKI MATTHEW T.

TAO JIAYUAN

TRAVIS JAKOB WEST

VARGHESE RAHUL

WU ZEBEN

YOON JASON

YU KELLY ZIYIN

YUNG ANDREW

Zhang Zhiyan (Thomas)

3 b

Problem 1, 40 points

4 b

Part a, 5 points

Find the remaining emitter junction areas , find R1.

Ae1=_______________ Ae2=_______________ R1=_______________

5 b

6 b

Part b, 6 points

Draw the complete circuit diagram. On it, label the DC voltages at ALL nodes, and the

DC collector currents of all transistors. Label the values of all resistors

7 b

8 b

Part c, 4 points

find the following

device Q3 Q4 Q5 Q6 Q7 Q8

gm,

mS

Rce,

k

Rbe,

9 b

Part d, 10 points.

Find the following,

Voltage Gain Input impedance

Q8

Q4,5,6,7 combination

Overall differential

Vout/Vin

10 b

11 b

12 b

13 b

Part e, 10 points

Maximum peak-peak output voltage (show all your work)

magnitude and sign of

maximum output signal

swing due to cutoff

magnitude and sign of

maximum output signal

swing due to saturation

Transistor Q3

Transistor Q8

Be warned: In some cases a limit is not relevant at all. Mark those answers "not relevant".

But, give a 1-sentence statement below as to why it is not relevant.

14 b

Part f, 5 points

write the answer to the question in this box

15 b

16 b

Problem 2, 20 points

17 b

Part a, 6 points

Draw the complete circuit diagram. On it, label the DC voltages at ALL nodes, and the

DC drain currents of all transistors. You *don't* need to calculate, or write down, the

value of R5.

18 b

Part b, 4 points

find the following

device M7 M8 M5

gm,

mS

19 b

Part c, 10 points.

You will now compute the differential gain. Find the following

Voltage Gain Input impedance

M5

M1,2,7,8 combination

Overall differential

Vout/Vin

20 b

21 b

22 b