![]() The capacitive version of this filter is not that much more complex, with only a resistor and capacitor needed for operation. The inductive low-pass filter is the pinnacle of simplicity, with only one component comprising the filter. The response of a capacitive low-pass filter falls off with increasing frequency. This low impedance in parallel with the load resistance tends to short out high-frequency signals, dropping most of the voltage across series resistor R 1. The capacitor’s impedance decreases with increasing frequency. The response of an inductive low-pass filter falls off with increasing frequency. This can be demonstrated with a SPICE analysis: (Figure below) This high impedance in series tends to block high-frequency signals from getting to the load. The inductor’s impedance increases with increasing frequency. ![]() There are two basic kinds of circuits capable of accomplishing this objective, and many variations of each one: The inductive low-pass filter in (Figure below) and the capacitive low-pass filter in (Figure also below). By definition, a low-pass filter is a circuit offering easy passage to low-frequency signals and difficult passage to high-frequency signals.
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