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Mixed Quiz
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1Nonlinear circuits include comparators, waveshapers, and active diode circuits.
A)True
B)False


2Some optimized comparators have internal capacitors built into input stages in order to protect sensitive circuits.
A)True
B)False


3If the output swing of a zero-crossing detector is too large for an application, back-to-back varactor diodes can be used and the output will be bounded.
A)True
B)False


4A Schmitt trigger is sometimes called a limit detector because a positive output indicates that the input voltage exceeds a specific limit.
A)True
B)False


5Thermal noise is caused by random motion of free electrons inside a resistor.
A)True
B)False


6A comparator that uses negative feedback is called a Schmitt trigger.
A)True
B)False


7Hysteresis is undesirable in a Schmitt trigger because it produces false triggering.
A)True
B)False


8A Schmitt trigger always produces a sine wave output.
A)True
B)False


9Oscillators are built with positive feedback.
A)True
B)False


10A pattern appears on an oscilloscope when harmonically related signals are applied to the horizontal and vertical inputs.


11A circuit that generates an output signal whose frequency depends on the charging of a capacitor is the oscillator.


12The class amplifier uses output transistors operating as switches.


13A is a circuit whose output voltage ideally switches from low to high or vice versa whenever the input voltage crosses zero.


14The input voltage of a comparator that causes the output voltage to switch states from low to high or vice versa is called the point.


15Comparators usually interface at their outputs with digital circuits such as .


16Any kind of unwanted signal that is not derived from or harmonically related to the input signal is referred to as .


17A differentiator can be configured by using a(n) circuit.


18What is the output waveform when a relaxation oscillator is cascaded with an integrator?
A)sine
B)square
C)rectangular
D)triangular


19In order to prevent an op amp differentiator from oscillating
A)a very small resistance is added to the input
B)a very large resistance is added to the input
C)a bypass capacitor is added to the output
D)positive feedback is used


20What is a circuit that has two input voltages and one output voltage which is either a low or a high voltage?
A)comparator
B)integrator
C)differentiator
D)oscillator


21What is the output waveform of a zero-crossing detector when the input signal is any periodic signal that crosses zero threshold?
A)sine wave
B)rectangular
C)sawtooth
D)Lissajous


22In order for a transistor output stage that is used with an IC comparator to work properly, an open collector must be connected to
A)an external resistor and supply voltage
B)a transformer coupled load
C)a coupling capacitor
D)ground


23A circuit that performs a mathematical operation and produces a ramp of output voltage is known as
A)an integrator
B)a comparator
C)a differentiator
D)an oscillator


24What type of waveform does a Schmitt trigger produce?
A)sine
B)square
C)rectangular
D)triangular


25What will reduce the effect of a diode’s knee voltage and enable the diode circuit to rectify, clip, and clamp signals with amplitudes less than the knee voltage?
A)an op amp with negative feedback
B)an op amp with positive feedback
C)a JFET
D)a BJT





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