11.12.2 Sinusoidal Steady-State Frequency Response of
Parallel RLC Circuit
The parallel RLC circuit and its phasor equivalent circuit are shown in Fig. 11.12-5.
Almost the entire source current flows through the inductor at low frequency since
the inductor is short-circuit at DC and low impedance for low frequency AC. Similarly,
almost the entire source current passes through the capacitor at high frequencies since the
capacitor impedance approaches zero as frequency increases without limit. Thus, the mag-
nitude response (i.e., gain) of inductor current must be a low-pass function. Magnitude
response of the capacitor current must be a high-pass function ...
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