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