EDC1 – Womework 2
1 punct
1.
a) Derive the vO1(vI) expression for the circuit.
What does the voltage transfer characteristic
vO1(vI) look like for vI∈[-12V;12V] and what is
the circuit application assuming vI as input and
vO1 as output.
b) Derive the vO2(vI) expression for the circuit.
What does the voltage transfer characteristic
vO2(vI) look like for vI∈[-22V;22V] and what is
the circuit application assuming vI as input and
vO2 as output.
c) For what application can be used the circuit
with vO as output? What does the vO(t) look like
for vI(t) a triangle wave with 0 dc component
and 10V amplitude.
R1=20KΩ
+VPS=15V
AO1
R2=20KΩ
vO1
-VPS=-15V
vO
+VPS=15V
vI
AO2
vO2
-VPS=-15V
R3=10KΩ
+VPS=9V
2.
a) Sketch qualitatively the VTC vO(vI). What is
the circuit application?
b) What are the expressions and the values of
VOL,VOH,VPL,VPH?
c) What does the vO(t) look like for vI(t) a
triangle wave with 0 dc component and 8V
amplitude? What about if the amplitude
becomes 4V?
d) If the following failure appears: the
connection between M and N points is broken,
what does the VTC modify and what is the
circuit application? Justify your answer.
M
R3
5KΩ
R2=9KΩ
N
R1=3KΩ
AO
vI
-VPS=-9V
vO
R4
1KΩ
3. R1=5k and R2=35k:
a) What is the voltage gain Av=vO/vI ?
b) What are the values of Ri and Ro?
c) Modify the circuit so that the gain can be adjusted in the [-10;-1]
range;
d) If to the inverting input of the circuit another vI2 is applied through
the medium of the R3=7k resistor (in addition to vI) what is the
expression of vO as a function of vI and vI2?
+12V
+
vO
-
vI
R2
R1
-12V
R3=9KΩ
4.
a) What is the expression vO(vI1,vI2) assuming the
operation of the op amp in its active region? What is the
circuit application?
b) What does the vO(t) look like for vI(t)=3sinωt[V] and
vI2=-4V?
c) Consider the vI2 source set to zero (vI2=0). What does vI1
the voltage transfer characteristic vO(vI1) look like for
vI1∈[-8V;8V]. Find the expressions and the values of: Av,
Ri, Ro.
d) Modify the initial circuit so that vO=vI1+vI2.
+VPS=12V
R1=3KΩ
OA
R2
6KΩ
-VPS=-12V
vO
A
vI2
M
R4
2KΩ