Tapped Inductor Matching
The impedance transformation ratio and Q-factor/matching bandwidth of the circuit can be set independently. A tapped inductor matching circuit is shown in Fig.1
From Fig.1, Q-factor of branch is given by,
(1)
At resonant frequency the circuit is redrawn, by parallel-to-series transformation, as shown in Fig.1(b).
(2)
(3)
(4)
(5)
(6)
If ,
(7)
Fig.1(c) illustrates the parallel R-L-C resonant circuit form of tapped inductor matching circuit.
(8)
(9)
When and
, using Eq.(7)
(10)
When Q-factors are large, from Eq.(7), we can conclude that the impedance transformation ratio is a function of inductors tap ratio. Hence the name tapped inductor matching for this matching circuit.
Good info, boy!. Many thanks.