1
1
Test #2
Oct. 22, 2009, Thursday, 6:30  7:30 PM,
FRNY G140
No calculator, no formula sheet, no cell phone.
Tables 13.1 and 13.2
will be handed out with the test.
Material covered:
Chap. 14, 15, 16 and 17, and notes
HW#4, #5, #6 and #7
A seating chart will be posted in 202 Help Room and on my
office door (MSEE 262) by
10/22/09 noon.
You have to sit in the assigned seat only.
MC and WO questions.
Turn in the scantron sheet
and
the test packet.
Bring PU ID
Class as usual, 10/19/09 (Mon.) and 10/21/09 (Wed.)
HW #7 is due on 10/19/09
No class,
10/23/09, Friday
2
Summary of Lecture #22
10/16/09
Resonant and bandpass circuits
•
What are filters for?
•
An exaample of impedance matching circuit
•
LP, HP, BP and BR filters
•
ϖ
o
and
ϖ
r
for circuits with one L and one C
•
Bandpass filters
•
Peak frequency:
ϖ
m
•
Half power frequencies:
ϖ
1
and
ϖ
2
•
Half power bandwidth: B
ϖ
=
ϖ
2
 ϖ
1
•
Pass band: [
ϖ
1
,
ϖ
2
]
•
Quality factor Q: Q =
ϖ
m
/ B
ϖ
•
Bandpass characteristic of parallel RLC circuits
•
Bandpass characteristic of series RLC circuits
•
Polezero plots of circuits with one L and one C
•
No finite zero and two complex poles
•
Single zero at the origin and two complex poles
•
Single zero off the origin and two complex poles
•
Two finite zeros and two complex poles
3
What are filters for?
•
To pass or block a narrow frequency
band
•
To maximize power transfer
from
source to load
•
To minimize reflection and interference
caused by impedance mismatch
4
Maximum power transfer theorem
Power supplied by
a DC source (represented
by
V
oc
and
R
th
or by
I
sc
and
R
th
) to a load
R
L
is maximized when
R
L
=
R
Th
provided
R
L
is the
variable
quantity.
Power supplied to the load is
For sinusoidal excitation, the time average
power to the load is maximized if
Z
L
=
Z
Th
*.
th
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 Fall '06
 RLC, Bandpass filter, ΩM, complex poles, parallel RLC circuits

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