30 Questions
In an ideal integrator, the feedback element is a(n):
One op-amp with a certain feedback arrangement
What must the ratio Rf /Ri be in a scaling adder?
Resistors must have a value of 4.7 kΩ times the number of inputs
What is the purpose of op-amp circuits?
The unity-gain frequency
What happens when you apply a triangular waveform in terms of output bounding in a comparator?
A portion of the output is fed back
Which stages are connected by copper strips in many isolation amplifiers?
Current loops
What characterizes the output of a differentiator?
Input stage and output stage
What is the primary purpose of offset nulling?
Zeroes the output error voltage
How does bias current compensation affect slew rate?
None of these
What effect does negative feedback have on an op-amp's voltage gain?
Reduces the voltage gain
What does the midrange open-loop gain of an op-amp extend from and to?
Answers (b) and (c)
What is the name for the frequency at which the open-loop gain of an op-amp equals 1?
Critical frequency
How do CMRR and bias current compensation affect input/output impedances and bandwidth?
Neither CMRR nor bias current compensation affect impedances or bandwidth
What is the purpose of AGC?
Increase the voltage gain
What does an input transducer convert?
Current to voltage
In an op amp with a rail-to-rail output, what can be said about its output stage?
It has a high output impedance
What happens when a JFET is used in an AGC circuit?
Output voltage varies based on input
If an op amp has an open-loop voltage gain of 100,000, what is the voltage gain at the open-loop cutoff frequency?
Cannot be less than 0 V
What is the typical value of open-loop voltage gain for an op amp?
100
What is the purpose of trimming a resistor?
Making a fine adjustment
How is gain adjusted for a 741 op amp?
Push-pull amplifier configuration
What is the equivalent of 1 ppm?
0.0001%
What does the slew-rate specification of an op amp indicate?
Attenuation against a common mode signal
What is true about the input stage of every op amp?
It is a common-base amplifier
What characterizes a virtual ground in an inverting amplifier?
It can sink a lot of current
What is the output voltage of the amplifier when the input signals are 2.5V and 2.4V?
-10 V
Which statement is true regarding operational amplifiers?
It has a high open-loop voltage and low output impedance
In a voltage-to-current converter, what does the output current depend on?
The resistance, R, across which the input voltage is present
If an op amp has an input bias current of 80 uA, what would be the predictable voltage gain?
79.2 uV
What is the common-mode rejection ratio of a differential amplifier with a voltage gain of 120×103?
-4
When the open-loop gain of an operational amplifier falls to unity, it is referred to as the __________.
+0.2 V
Test your knowledge of electrical engineering terminology with this quiz. Questions cover topics such as phase difference, load currents, automatic gain control, transducers, and thermistors.
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