◆ High and low impedance criteria
The following criteria can be used to roughly discriminate between low, middle,
and high impedances by following figure. The medium Z range may be covered
with an extension of either the low Z or high Z range. These criteria differ some-
what, depending on the frequency and component type.
In the frequency region where the primary capacitance or inductance of a compo-
nent exhibits almost a flat frequency response, either a series or parallel equiva-
lent circuit can be applied as a suitable model to express the real impedance
characteristic. Practically, the simplest series and parallel models are effective in
most cases when representing characteristics of general capacitor, inductor, and
resistor components.
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