CHAPTER 13 FLOYD

has two trigger points

A comparator with hysteresis A. has one trigger point B. has two trigger points C. has a variable trigger point D. is like a magnetic circuit

any number of inputs

A summing amplifier can have A. only one input B. only two inputs C. any number of inputs

0.2

An average amplifier has five inputs. The ratio RfIRi must be A. 5 B. 0.2 C. 1

a ramp

For a step input, the output of an integrator is A. a pulse B. a triangular waveform C. a spike D. a ramp

4.7 kΩ

If the voltage gain for each input of a summing amplifier with a 4.7 kΩ feedback resistor is unity, the input resistor must have a value of A. 4.7 kΩ B. 4.7 kΩ divided by number of inputs C. 4.7 kΩ times the number of inputs

a portion of the output is feedback to the noninverting input

In a comparator with hysteresis A. a bias voltage is applied between the two inputs B. only one supply voltage is used C. a portion of the output is feedback to the inverting input D. a portion of the output is feedback to the noninverting input

resistor

In a differentiator, the feedback element is A. resistor B. capacitor C. zener diode D. voltage divider

each proportional to the weight of its input

In a scaling adder, the input resistors are A. all the same value B. all of different values C. each proportional to the weight of its input D. related by a factor of two

crosses zero

In a zero-level detector, the output changes state when the input A. is positive B. is negative C. crosses zero D. has a zero rate of change

capacitor

In an integrator, the feedback element is a A. resistor B. capacitor C. zener diode D. voltage divider

change back and forth erratically between two states

Noise on the input of a comparator can cause the output to A. hang up in one state B. go to zero C. change back and forth erratically between two states D. produce the amplified noise signal

answer b and d

The effect the noise can be reduced by A. lowering the supply voltage B. using positive feedback C. using negative feedback D. using hysteresis E. answer b and d

answer a and b

The output of a differentiator is proportional to A. the RC time constant B. the rate at which the input is changing C. the amplitude of the input D. answer a and b

all of these

The rate of change of an integrator's output voltage in response to a step input is set by A. the RC time constant B. the amplitude of the step input C. the current through the capacitor D. all of these

comparator

The zero-level detector is one application of a A. comparator B. differentiator C. summing amplifier D. diode

limits the output levels

Using the output bounding in a comparator A. makes faster B. keeps the output positive C. limits the output levels D. stabilizes the output

a square waveform

When you apply a triangular waveform to the input of a differentiator, the output is A. a dc level B. an inverted triangular waveform C. a square waveform D. the first harmonic of the triangular waveform