Active Filters – N4notes

Active Filters

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The critical frequency is defined as the point at which the response drops _________ from the passband.

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Which filter exhibits a linear phase characteristic?

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Which filter has a maximally flat response?

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Which filter exhibits the most rapid roll-off rate?

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A third-order filter will have a roll-off rate of

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A low-pass filter has a cutoff frequency of 1.23 kHz. Determine the bandwidth of the filter.

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The bandwidth in a _____ filter equals the critical frequency.

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A _____ filter significantly attenuates all frequencies below fc and passes all frequencies above fc.

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A _____ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band.

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A _____ filter rejects all frequencies within a specified band and passes all those outside this band.

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Filters with the _____ characteristic provide a very flat amplitude in the passband and a roll-off rate of –20 dB/decade/pole.

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Filters with the _____ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole.

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Filters with the _____ characteristic are used for filtering pulse waveforms.

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One important application of a state-variable _____ filter with a summing amplifier is to minimize the 60 Hz "hum" in audio systems.

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Active Filters
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