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Operational Amplifiers
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Operational Amplifiers
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The voltage required to force the differential output to zero is called _______
input-offset current
input bias current
input-offset voltage
slew rate voltage
An?inductor?stores energy in electromagnetic field created bycurrent.
stored energy is expressed as
W=LI2
W=1/2 LI2
W=1/2 LI
W=2LI
The major difference between ground and virtual ground is that virtual ground is only a
power reference
difference reference
voltage reference
current reference
When a capacitor is used in place of a resistor in an op-amp network, its placement determines
integration or differentiation
addition or subtraction
open- or closed-loop gain
saturation or cutoff
A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of3250.
What would the output voltage be if the single-ended input voltage was 7 mV rms
4.55 V rms
650 mV rms
1.4 mV rms
0.455 V rms
The closed-loop voltage gain of an inverting amplifier equals
the input resistance
the open-loop voltage gain
the feedback resistance divided by the input resistance
the ratio of the input resistance to the feedback resistance
What starts a free-running multivibrator
Nothing
an input signal
an external circuit
a trigger
In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will
swing negative
swing positive
close the loop
be balanced
What is the output voltage
–15 V
5 V
–5 V
15 V
If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value
Cutoff
Saturation
9.52 V
7.82 V
What is the difference between common-mode and differential-mode input signals
Current
phase relationship
Voltage
apparent power
If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what
single-ended
double-ended
Noninverting mode
common-mode
Input impedance [Zin(I)] of an inverting amplifier is approximately equal to
Rf – Ri
Ri
Rf + Ri
∞
An ideal operational amplifier has
All of the above
infinite output impedance
zero input impedance
infinite bandwidth
What is the frequency of this 555 astable multivibrator
278 Hz
8 Hz
78 Hz
178 Hz
______ is NOT a characteristic of an ideal op-amp
Minimum bandwidth
Infinite input impedance
Zero output impedance
Infinite voltage gain
Current cannot flow to ground through a(n) ________
ac ground
mechanical ground
virtual ground
virtual short
What three subcircuits does a phase locked loop (PLL) consist of
phase comparator, low-pass filter, and VCO
phase comparator, bandpass filter, and demodulator
phase comparator, bandpass filter, and VCO
phase comparator, comparator, and VCO
Decreasing the gain in the given circuit could be achieved by
increasing the value of the input resistor
removing the feedback resistor
increasing the value of the feedback resistor
reducing the amplitude of the input voltage
The ratio between differential gain and common-mode gain is called
Phase
common-mode rejection
differential-mode rejection
Amplitude
What is the output waveform
Sine wave
Square wave
–15 V
+15 V
An output that is proportional to the addition of two or more inputs is from which type of amplifier
difference
analog subtractor
differentiator
summing
A circuit that uses an amplifier with passive filter elements is called a(n)
signal generator
relaxation oscillator
active filter
differential amplifier
In a PLL, to obtain lock, the signal frequency must
be less than the capture frequency
come within the lock range
be greater than the capture frequency
come within the capture range
A PLL can be used as a(n) ___________
frequency multiplier
relaxation oscillator
series voltage regulator
Schmitt trigger
The input voltage must be ______ in the given circuit to obtain the given output voltage
480 mV
400 mV
343 mV
600 mV
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will
not invert the signal
have high reverse current
be virtual ground
not need an input resistor
The input offset current equals the
difference between two base currents
difference between two base-emitter voltages
collector current divided by the current gain
average of two base currents
What is the cutoff frequency of this low-pass filter
4.8 KHz
1.8 kHz
2.8 kHz
3.8 kHz
A noninverting closed-loop op-amp circuit generally has a gain factor
less than one
greater than one
of zero
equal to one
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