EEE :: Passive Filters
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In an RL high-pass filter, the output is taken across the inductor and the output leads the input.
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In an RC high-pass filter, the output is taken across the resistor and the output leads the input.
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The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency.
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In an RC low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage.
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In an RL low-pass filter, the output voltage is taken across the inductor and the output lags the input.
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A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others.
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A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others.
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