Active Filters

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

A:

–20 dB

B:

–3 dB

C:

–6 dB

D:

–40 dB

Answer: B

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Refer to the given figure. The cutoff frequency of this filter is ________, and the circuit is known as a ________.

A:

721 Hz, low-pass filter

B:

721 Hz, high-pass filter

C:

72 Hz, low-pass filter

D:

721 Hz, band-pass filter

Answer: A

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Which filter exhibits a linear phase characteristic?

A:

Bessel

B:

Butterworth

C:

Chebyshev

D:

all of the above

Answer: A

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Refer to this figure. This is a ________ filter.

A:

low-pass

B:

high-pass

C:

band-pass

D:

band-stop

Answer: B

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Refer to the given figure. The roll-off of the circuit shown is about

A:

20 dB/decade.

B:

40 dB/decade.

C:

60 dB/decade.

D:

80 dB/decade.

Answer: A

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Questions for: Active Filters