operational amplifiers Flashcards
An ideal operational amplifier has
infinite output impedance
zero input impedance
infinite bandwidth
All of the above
infinite bandwidth
Another name for a unity gain amplifier is:
difference amplifier
comparator
single ended
voltage follower
voltage follower
The open-loop voltage gain (Aol) of an op-amp is the
external voltage gain the device is capable of
internal voltage gain the device is capable of
most controlled parameter
same as Acl
internal voltage gain the device is capable of
A series dissipative regulator is an example of a:
linear regulator
switching regulator
shunt regulator
dc-to-dc converter
linear regulator
A noninverting closed-loop op-amp circuit generally has a gain factor:
less than one
greater than one
of zero
equal to one
greater than one
In order for an output to swing above and below a zero reference, the op-amp circuit requires:
a resistive feedback network
zero offset
a wide bandwidth
a negative and positive supply
a negative and positive supply
Op-amps used as high- and low-pass filter circuits employ which configuration?
noninverting
comparator
open-loop
inverting
inverting
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will:
not need an input resistor
be virtual ground
have high reverse current
not invert the signal
be virtual groun
An astable multivibrator is also known as a:
one-shot multivibrator
free-running multivibrator
bistable multivibrator
monostable multivibrator
free-running multivibrator
With negative feedback, the returning signal:
aids the input signal
is proportional to output current
opposes the input signal
is proportional to differential voltage gain
opposes the input signal
What starts a free-running multivibrator?
a trigger
an input signal
an external circuit
nothing
nothing
A portion of the output that provides circuit stabilization is considered to be:
negative feedback
distortion
open-loop
positive feedback
negative feedback
How many leads does the TO-5 metal can package of an operational amplifier have?
8, 10, or 12
6, 8, or 10
8 or 14
8 or 16
8, 10, or 12
The closed-loop voltage gain of an inverting amplifier equals:
the ratio of the input resistance to the feedback resistance
the open-loop voltage gain
the feedback resistance divided by the input resistance
the input resistance
the feedback resistance divided by the input resistance
All of the following are basic op-amp input modes of operation EXCEPT
inverting mode
common-mode
double-ended
single-ended
inverting mode
A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?
common-mode
darlington
differential
operational
differential
With negative feedback, the returning signal
is proportional to the output current
is proportional to the differential voltage gain
opposes the input signal
aids the input signal
opposes the input signal
The voltage follower has a:
closed-loop voltage gain of unity
small open-loop voltage gain
closed-loop bandwidth of zero
large closed-loop output impedance
closed-loop voltage gain of unity
The ratio between differential gain and common-mode gain is called:
amplitude
differential-mode rejection
common-mode rejection
phase
common-mode rejection
In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:
swing negative
close the loop
be balanced
swing positive
swing positive