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The exam will be 2 hours duration and most probably 3 to 4 questions in it. Also sample final exam is attached to guage the type of questions that will be asked.

İSTANBUL TEKNİK ÜNİVERSİTESİ
Faculty of Electrical and Electronics Engineering
Assistant Prof. Tufan C. Karalar
EHB413E Midterm Exam
Name:
ID Number:
Q1:
Q2:
Q3:
Q4:
Total:
Fall 2015
Question 1.(20 pts)
For the amplifier stage given below,
a) Calculate the output impedance
b) Calculate the small signal transconductance GM.
c) Calculate the small signal gain vout/vin.
Using gm, ro, etc.
VDD#
RD#
Vb#
Vout#
Vin#
M1#
Question 2 (30 pts)
For the circuit given below, (W/L)1 = (W/L)2 and (W/L)3 = (W/L)4.
a) What is IOUT in terms of IB and other device parameters
b) What’s the minimum Vo voltage that will still keep M4 and M2 both in
saturation? (In terms of gm, ro, IB Vdsat, Vth etc.)
c) What is the RB resistor value to allow this minimum Vo value?
IB#
RB#
VO#
IOUT#
M3#
M4#
M1#
M2#
Question 3 (20 pts)
Please calculate the Av = Vout/(Vi+- Vi-)of this amplifier for the following
cases..
a) R1 = ∞
b) R1 = 1/gm3
VDD#
M3#
M4#
Vout#
Vi+#
M1#
R1#
M2#
ISS#
Vi)#
Question 4 (30 pts)
For the diff pair below differential gain is defined as follows
Av = (Vo+ - Vo-) / (Vi+ - Vi-)
a. For low frequency please calculate Av.
b. For C1=C2 please calculate the Pole frequency associated with the output.
c. Draw the bode plot of the differential gain.
d. Fro C1 << C2, redraw the Bode Plot of the differential gain
VDD#
C1#
RD#
Vo+#
Vi+#
C2#
RD#
Vo+#
M1#
M2#
ISS#
Vi+#
İSTANBUL TEKNİK ÜNİVERSİTESİ
Faculty of Electrical and Electronics Engineering
Assistant Prof. Tufan C. Karalar
Sample EHB413E Final Exam
Name:
ID Number:
Q1:
Q2:
Q3:
Total:
Question 1.(40 pts)
For the circuit given below,
a) What is the functionality of this circuit
b) What are the min and max values of Vin to keep all the devices in
saturation
c) What is the bias voltage on VX
d) What are the pole and zero frequencies.
e) Bode Plot of Vo/Vin, in the Bode plot annotate, low frequency gain, first
and second poles, unity gain frequency
Calculate all results using parameters such as gm, ro, Cc etc.
M4#
M3#
X#
M1#
M2#
Vin#
CC#
Vout#
CL#
M5#
Question 2 (30 pts)
For the circuit given below,
a) What is the Bias voltage level at Vx
b) Find the transfer function Vout/Vin
c) What type of feedback network is this
d) What is the loop gain
e) What is the output impedance at low frequency?
M3#
gm=0.3m,##
ro=50k#
X#
gm=1m,##
M1# ro=15k# M2#
gm=1.5m,##
ro=10k#
M5#
M4#
CC=1pF#
Vout#
CL=2pF#
Vin#
RO=1k#
R1=10k#
R2#=#12k#
Question 3 (30 pts)
Please calculate the Av = Vout/(Vi+- Vi-)of this amplifier for the following
cases..
a) Determine the poles frequencies, for C1=C2=0
b) Stabilize the circuit by only adding C1. What should be the value of
C1 for 450 phase margin?
c) Stabilize the circuit by using only C2.. What is the C2 value for 600
phase margin?
Vin#
gm=1mS,#
ro=20k#
C2#
Vout#
Gm=2mS,#
ro=10k#
C1#
M5#
Cpar=100fF#
CL#=#1pF#
...

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