EE3 Fall Quarter 2015
Practice Problems 8
Find Y = f(X,A,B,C,D) in the block diagram below.
1
X
+
A
+
B
+
C
Y
D
What is the transfer function (AKA gain G) Y/X of this system?
X 1 = X DY
X 2 = AX 1 = AX ADY
X 3 = BX 2 = ABX ABDY
X 4 = X 3$ X 2 = ABX ABDY $
EE3 Spring 2016
Practice Problems 3
1. What kind of filter is this circuit?
a. Band pass
b. Low pass
c. High pass
d. Band stop
e. It's not a filter
vin
This is a voltage divider. The resistor and capacitor are in one leg of the divider,
and the inductor i
EE3 Spring 2016
Practice Problems 7
1. A PN junction diode allows current to flow only one way through it because:
a. A capacitor at the junction blocks current
b. Ohms law is actually nonlinear
c. It is a solar cell
d. A built-in voltage is across the ju
EE3 Spring 2016
Practice Problems 4
1
1. To find the trajectory followed by v out ,
use the KCL Method:
5V
i R(i C = 0
v out
dv
(C out = 0
R
dt
dv out
1
(
v =0
dt
RC out
)
4.7 K
1.2 F
vout
dv out
= Ase st
dt
Try v out = Ae st ; then
So Ase st (
+
t=0
2
A
EE3 Spring 2016
Practice Problems 5
3.3 F
1. Using the expressions for capacitive and
inductive impedance, find the total
impedance presented by the capacitor,
inductor, and resistor to the voltage
source. Set = 1000 rad/s.
+ +
0.75 H
1.8 K
Z tot = Z C Z
EE3 Fall 2015
Practice Problems 2
7
1. The 3 nodes have voltages labeled V1, V2, and
V3. Write the KCL equations for V1 and V3, and
then solve for V1 and V3. NOTE: you do not
need a KCL equation for V2. Why?
V1 node:
5
V1
3
V 116 V 1V 3 V 1
&
&
=0
5
7
3
V
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EE3 Spring 2016
Practice Problems 6
1.
This circuit uses NPN transistors
operating digitally (that is, they are
either fully on and conducting
heavily, or fully off and not
conducting at all). The circuit
therefore implements a logical
function. What is t