1
2
Summary of Lecture #24
10/21/09
Filters with real or practical inductors and
capacitors
•
Series and parallel circuit models for real
inductors,
L
and
Q
L
•
Parallel and series circuit models for real
capacitors,
C, Q
C
and
d
C
•
Two examples
3
Primary circuit element: Inductance,
L
Parasitic circuit elements:
Wire resistance,
R
s
Capacitance between
conductors,
C
p
Leakage resistance,
R
p
Quality factor of inductor
at a certain frequency,
Q
L
Circuit models of real inductors
Values typically given:
–
Nominal inductance :
L
–
Coil Q at certain frequency :
Q
L
s
L
R
L
Q
ϖ
=
L
s
Q
L
R
ϖ
=
4
Circuit
models
of
real
capacitors
Primary circuit element:
Capacitance
C
Parasitic circuit elements:
Wire resistance
R
s
Wire inductance
L
s
Leakage resistance
R
p
Quality factor of capacitor at
a certain frequency
Q
c
=
ϖ
CR
p
Dissipation factor :
d
c
=1/Q
C
Values typically given:
–
Nominal capacitance:
C
–
Dissipation factor at a certain freq.:
d
C
p
c
c
CR
1
Q
1
d
ϖ
=
=
C
p
Q
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 Fall '06
 Parallel Circuit, Series Circuit, RLC, Inductor, Rp Quality factor

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