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Mixed Quiz
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1Positive feedback can stabilize voltage gain, increase input impedance, and decrease output impedance.
A)True
B)False


2A current-controlled voltage source is sometimes called a transconductance amplifier.
A)True
B)False


3A voltage-controlled current source (VCIS) is also called a current-to-voltage converter.
A)True
B)False


4The conversion factor for the voltage-controlled current source (ICVS) is called transconductance and expressed in siemens (mhos).
A)True
B)False


5The worst-case error of closed-loop voltage gain occurs when the op amp open-loop voltage gain is maximum.
A)True
B)False


6The closed-loop impedance of a voltage-controlled voltage source is very large, usually much larger than its input resistance.
A)True
B)False


7Nonlinear distortion called harmonic distortion can be measured with a distortion analyzer.
A)True
B)False


8Negative feedback increases harmonic distortion.
A)True
B)False


9With a voltage-controlled current source, an input voltage controls an output current.
A)True
B)False


10The feedback factor indicates how much of the output voltage is attenuated before the feedback signal reaches the inverting input of an op amp.


11 gain is the op amp’s voltage gain of the forward and feedback paths.


12Because of the heavy negative feedback, the current-controlled current source tends to act like a perfect amplifier.


13A amplifier is another name for the current-controlled voltage source.


14The conversion factor of the voltage-controlled current source is called


15The worst-case error of closed-loop voltage gain occurs when the open-loop voltage gain is .


16Nonlinear distortion is often referred to as distortion.


17The op amp has an open-loop voltage gain of approximately .


18A current-controlled current source has a
A)very low input impedance and a very high output impedance
B)very high input impedance and a very low output impedance
C)very high input impedance and a very high output impedance
D)very low input impedance and a very low output impedance


19The input to a negative-feedback amplifier is
A)a voltage only
B)a current only
C)either voltage or current
D)regenerative


20The voltage-controlled current source is also called a
A)current-to-voltage converter
B)transresistance amplifier
C)voltage-to-current converter
D)regenerative feedback amplifier


21What stabilizes the voltage gain and has an enhancing effect on quantities such as gain stability, distortion, offsets, input impedance and output impedance?
A)loop gain
B)positive feedback
C)attenuated feedback
D)harmonics


22The overall output impedance looking back into the voltage-controlled voltage source amplifier is called the
A)voltage source output impedance
B)voltage-controlled output impedance
C)open-loop output impedance
D)closed-loop output impedance


23Harmonic distortion can be measured with a
A)signature analyzer
B)frequency generator
C)frequency counter
D)distortion analyzer


24What concept is reinforced by noting that all of the input current of the current-controlled voltage source amplifier must flow through the feedback resistor?
A)loop gain
B)feedback fraction B
C)virtual ground
D)gain-bandwidth product


25For an undistorted output over the entire closed-loop bandwidth, the closed-loop cutoff frequency must be
A)less than the power bandwidth
B)more than the power bandwidth
C)equal to the power bandwidth
D)above 20 kHz





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