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
