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Exam 19: Active Filters Key

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Question 21

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The highest frequency in the passband of a low-pass filter is called the

A) optimal frequency.
B) resonant frequency.
C) cutoff frequency.
D) pole frequency.

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Question 22

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A first-order filter can implement only a Butterworth response because first-order stages have no

A) resonant frequency.
B) capacitors.
C) resistors.
D) active devices.

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Question 23

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Which filter is configured as a voltage-controlled voltage source filter?

With regard to filter performance,limited gain-bandwidth product of an op amp

Which filter has as its passband all frequencies between the lower and upper cutoff frequencies?

Which of the following is not one of the five types of filters?

Having voltage gain,center frequency,and bandwidth all independently tunable is a major advantage of which type filter?

If a rippled passband is acceptable,the Chebyshev and elliptic filters are the filters of choice.

The order of an active filter depends on the number of transistor circuits it contains.

A filter that consists of three cascaded second-order stages has an order of ________.

A high-order active filter can be built by cascading second-order stages whose resonant frequencies and Qs are staggered in precisely the right way to get the desired overall response.

If the Q of a bandpass filter is less than 1,it is called a

The bandstop filter is sometimes called a notch filter because it removes all frequencies in the stopband.

As a filter circuit's damping factor is increased,what happens to the resonant peak?

Which of the following is not one of the five basic approximations?

A low-pass filter passes all frequencies from zero to the cutoff frequency and blocks all frequencies above the cutoff frequency.

If the damping factor is increased,the resonant peak increases.

When filter stages are cascaded,how is the total decibel attenuation calculated?

A filter that has a passband and no stopband is the ________.

The voltage gain of a Sallen-Key notch filter must be less than 2 in order to