Impedance transformation of loop taps In the practical application of high-frequency circuits, a parallel oscillation circuit in which the excitation signal source or load and the inductance or capacitance in the oscillation circuit are partly connected is often called a tapped oscillation circuit or partly connected in parallel.
1 Commonly used tap oscillation circuit
Partial access of inductance tap part access of capacitor voltage divider
Typical practical circuit:
2 Equivalent circuit: In the quantitative analysis of the circuit, the partly connected external circuit is often equivalent to both ends of the parallel circuit. 
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