Lecture 18
Parallel Resonant Circuit with Non-ideal Circuit Elements
The following items are covered:
•
Conversion of a practical tank circuit, with coil resistance, to an
equivalent parallel resonant circuit with ideal elements
•
Derivation of the expression for resonant frequency for the
practical tank circuit
•
Analysis of the effect of approximating the practical tank circuit
•
Solve numerical example with the practical tank circuit
Parallel Resonance with Practical Tank circuit
The circuit for a practical tank circuit is shown in Figure 18-1
R
l
represents the resistance of the coil, having inductance L.
R
l
X
L
X
C
Fig. 18-1 Practical tank circuit
The resistance R
l
can no longer be included in a simple series or
parallel combination with the source resistance and any other
resistance for design purposes. Even though R
l
is usually relatively
small in value compared with other resistance and reactance
levels of the network, it does have an important impact on the
parallel resonant conditions, as will be demonstrated through
numerical example.

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