About Passive Filters
Passive filters use only passive components such as resistors, capacitors and inductors. They do not produce any amplification of the input signal. In passive filters, the size and arrangement of these electrical and electronic components determines which frequencies are allowed to pass. Typically, passive filters use resistor-capacitor (RC), resistor-inductor (RL), inductor-capacitor (LC), or resistor-inductor-capacitor (RLC) circuits. Resistors are two-terminal devices which resist an electric current by producing a voltage drop across its terminals. Inductors block high-frequency signals and conduct low-frequency signals. By contrast, capacitors block low-frequency signals and conduct high-frequency signals.
Engineering Web: Passive Filters - Machine Design
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