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What is the frequency of this 555 astable multivibrator
178 Hz
8 Hz
278 Hz
78 Hz
Common-mode signals have _____
the same frequency
All of the above
the same phase
the same amplitude
The Schmitt trigger is a two-state device that is used for
pulse shaping
input noise rejection
filtering
peak detection
An output that is proportional to the addition of two or more inputs is from which type of amplifier
summing
differentiator
difference
analog subtractor
With negative feedback, the returning signal
opposes the input signal
is proportional to the output current
is proportional to the differential voltage gain
aids the input signal
An ideal amplifier should have
high output impedance
high input current
moderate gain
zero offset
The input offset current equals the
average of two base currents
difference between two base-emitter voltages
collector current divided by the current gain
difference between two base currents
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
common-mode
double-ended
Noninverting mode
If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary
0.62 kilohms
6240 ohms
410 ohms
2.4 kilohms
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will
not need an input resistor
be virtual ground
not invert the signal
have high reverse current
The magnitude of closed-loop voltage gain
(Acl) of an inverting amplifier equals
the feedback resistance divided by the input resistance
the ratio of the input resistance to the feedback resistance
the open-loop voltage gain Aol
the input resistance
How many leads does the TO-5 metal can package of an operational amplifier have
8 or 14
8, 10, or 12
8 or 16
6, 8, or 10
The Q of a crystal _________
is extremely high
None of the above
is extremely low
is about 40 or so in most cases
How many logic states does an S-R flip-flop have
3
5
2
4
What three subcircuits does a phase locked loop (PLL) consist of
phase comparator, bandpass filter, and VCO
phase comparator, low-pass filter, and VCO
phase comparator, bandpass filter, and demodulator
phase comparator, comparator, and VCO
The closed-loop voltage gain of an inverting amplifier equals
the feedback resistance divided by the input resistance
the open-loop voltage gain
the ratio of the input resistance to the feedback resistance
the input resistance
When a capacitor is used in place of a resistor in an op-amp network, its placement determines
saturation or cutoff
open- or closed-loop gain
integration or differentiation
addition or subtraction
Another name for a unity gain amplifier is
Comparator
single ended
difference amplifier
voltage follower
Decreasing the gain in the given circuit could be achieved by
increasing the value of the input resistor
increasing the value of the feedback resistor
reducing the amplitude of the input voltage
removing the feedback resistor
The voltage follower has a
large closed-loop output impedance
closed-loop bandwidth of zero
small open-loop voltage gain
closed-loop voltage gain of unity
1
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