Radio Frequency Integrated Circuit Design - Webs

76 Radio Frequency Integrated Circuit Design
Similarly, for the case of the inductor,
R p = R s (1 + Q 2 ) (4.9)
2
Q
L p = L s�1 + Q 2�
(4.10)
For large Q, parallel and series L are about the same and similarly parallel
and series C are about the same. Also, parallel R is large, while series R is small.
4.5 Tapped Capacitors and Inductors
Another two very common basic circuits that appear often are shown in Figure
4.16. This is the case of two reactive elements with a resistance in parallel with
one of the reactive elements. In this case, the two inductors or two capacitors
act to transform the resistance into a higher equivalent value in parallel with
the equivalent series combination of the two reactances.
Figure 4.16 Narrowband equivalent models for (a) a tapped capacitor and resistor, and (b)
a tapped inductor and resistor.