Op Amp
The voltage divider circuit block provides
(+-)2.5V or (+-)0.5V
Based on the information provided, Vo equals
-12 Vdc
The bandwidth of inverting amplifier is measured at the
-3dB and circuit breakpoint
Which statement is true?
-An op amp can detect voltage differences between its input terminals. -In a comparator circuit, a reference voltage shifts the trigger point of the circuit. A zener diode can be used in the feedback path of a voltage comparator.
A common mode input voltage
-Is simultaneously present at both inputs of a difference amplifier. -Can represent an undesirable cicuit input. -Is greatly attenuated by a difference amplifier.
A typical differential amplifier circuit constructed with an op amp
-Is subject to slew rate limitations and bandwidth limitations.
Based on the circuit configuration, Vo equals
-[0.5 x (V1 + V2)]
Based on the circuit values, Vo is expressed by
-[4 x (V1 + V2)]
The circuit output voltage measures -2 Vdc. Based on the circuit values, what is the circuit input voltage?
0.2 Vdc
Based on circuit values, Vo equals
0.5 Vdc; 2.5 Vdc; Vo = -(V1+V2+V3+V4); the circuit summing is at virtual ground, the differential input voltage (Vo) of U1 is 0V.
As s1 is toggled back and fourth, v0 switches between.
0.7 and -5.1 vdc
If the feedback resistor is doubled what is the new gain? The initial gain is 75.
150
If an input voltage of 0.2 Vdc is applied to the circuit, the output voltage is
2 Vdc
For a general purpose practical op amp, open-loop voltage gain is about what?
200,000
To configure this circuit for summation of the input voltages, change the value of the indicated (1k) resistor to
3k ohm's
the circuit output must represent the sum of the input voltages, circuit gain is set to
4
If V1 and V2 are equal in value, Vo =
4 x Va
Based on the non-inverting circuit, Vo =
4 x [(V1 + V2)/2]
Circuit gain is 10 and R1(in) is 5 Kohm's. The feedback resistor RF is
45k ohm's
Based on the given circuit information, the value of Rf is
50 k ohm's
Which statement about a difference amplifier is false?
A difference amplifier does not saturate.
Which of the following op amp statements is false?
An open-loop configuration requires some form of feedback
Which circuit illustrates a difference amplifier.
B
An op amp configured as an open loop comparator
Compares voltages
In the comparator circuit CR1
Conducts as a zener and rectifier diode.
Which of the following is NOT a characteristic of an op amp?
DC instability
Op Amp package types include
DIP, mini DIP, flat packs
In an op amp comparator circuit, hysteresis
Decreases input sensitivity
A voltage follower circuit
Has a gain of 1, unity gain, doesn't invert polarity of its output
Based on the given circuit information, the correct circuit(s) (ignore direction) is (are)
IL = 1mA, IF = 1mA, Iin = 1mA
Which statement about the difference amplifier circuit is true
If v2 is greater than v1, Vo and v2 are in phase
Typical voltage follower circuits are used as
Impedance matching devices
Voltage comparators perform as
Level Detectors
In a comparator configuration, threshold voltage is determined by..
Open loop saturation voltage
In this circuit, if Vo equals (R4/R1) X (V2-V1), then
R1 EQUALS R2, AND R3 EQUALS R4.
In this circuit If Vo equals V2-V1, make
R1,R2,R3 AND R4 EQUAL
A decrease in circuit bandwidth results from an increase in the value of
R2
Which of these statements is false?
R3 forms an essential element of the circuit gain factor
In this circuit, if Vo=4x (V2-V1), then
R3=R4=40K
For the application, the gain of the inverting amplifier circuit essentially equals
Rf/Rin
In the comparator curcuit, Vo is
Slightly out of phase with Vin.
Based on information provided,
Vo equals 2xV2 or 2xV1
In voltage comparator circuits CR1
Vo is clamped at -5.1 Vdc, gnerates a negative feedback voltage, improves circuit respone
Based on information provided,
Vo is essentially 0v
The threshold voltage (Vth) of this circuit equals
VsAT/(RH/R1)
For an inverting amplifier to reproduce input signals with a wide range of frequencies, the amplifier should possess
a wide bandwidth
The Attenuator circuit block provides a means attenuate or reduce
an input signal
Which statement is false?
an inverting summing amplifier does not alter the polarity of the summed voltages
The inverting input of this op amp is
at virtual ground
In a summing circuit where R1 through R4 are equal in value, V(a) equals the
average of the input voltages
An inverting summing amplifier can be configured to
average several input voltages, apply specific weights to each input as a nulling voltage
If the input voltages of an op amp are identical and the output voltage is 0Vdc. The op amp is
balanced
Full-power circuit performance refers to
bandwidth
Offset current changes caused by drift
cause small errors in circuit output voltage
To adjust the output offset voltage of an op amp, connect circuit inputs to
circuit common
Which statement about a gain-of-one amplifier is true?
circuit input and feedback resistors must be of equal value.
When an inverting op amp is operated with a DC output offset voltage
clipping can be asymectrical
In this circuit, the value of R1 is increased. As a result, the circuit gain and bandwidth
decrease and increase, respectively
To increase the circuit gain
decrease the value of Rin
A capacitor is placed in parallel with the circuit feedback resistor. The circuit bandwidth
decreases
In this circuit, R2
decreases the input impedance of the op amp
A properly balanced (trimmed) op amp with grounded inputs has an output voltage
equal to 0V
This op amp is balanced and not saturated if the potential at the inverting input
equals the potential of the non-inverting input
In the circuit applications, closed-loop gain is directly related to the op amp what?
external components
For low frequencies, the AC gain of an inverting amp is determined by the ratio of the circuit
feedback resistor to the input resistor
Quad op amp is a single package with
four individual op amps
The inverting unity gain
has a gain equal to the ratio of R3 toR1, inverts the polarity of the Vi, input impedance = R1
The circuit output voltage can be increased by an
increased input signal, increased value of the feedback resistor, decreased value of R1
An ideal voltage follower has
infinite input impedance and zero output impedance
The small current at the input of an op amp is
input bias current
The two inputs of an op amp are marked (-) and (+). These inputs provide what?
inverting and non-inverting
The amplifier bandwidth of this circuit
is less than 100Hz
In a follower configuration, the offset voltage of the LF441 op amp need not be trimmed because
it is low in value
Op amps possess
low output impedance
An inverting amplifier uses
negative feedback
The circuit feedback voltage is applied to the
negative input of the op amp and is in phase with the input
The input of a noninverting op amp is applied to the
non-inverting input terminal of the op amp
When the LF441 op amp is in a dual or quad style package
null pins are not available
The simplest voltage follower configuration requires a direct connection between the
output and inverting terminals of the op amp
If the gain of an inverting op amp is very high, the circuit
output can be clipped and distorted
A term associated with the error voltage caused by input bias current is
output offset voltage
When an op amp is viewed from the top,
pin count is CCW
When an op amp is viewed from the bottom,
pin count is CW
Op Amp packages are available in
plastic, metal, ceramic
If a positive voltage is applied to the input of a noninverting op amp, the output voltage is
positive
In this circuit, the output voltage (Vo) must be
positive
If the circuit load resistor is varied (within design limits), circuit voltage gain
remains the same
Slew rate refers to
response time
A non-inverting summing amplifier cannot
scale or weight
In an open-loop configuration, op amps are what?
sensitive to small input voltage variations
If the circuit output must represent the average of the input voltages,
short RG and remove RS
For a TO-type metal can package, pin 1 is located adjacent to a
tab
To generate a test signal lower in amplitude than can be supplied by your signal generator use
the attenuator circuit
If the input voltage of an inverting amp is positive
the circuit output voltage is greater than the input voltage and has opposite polarity
Which statement about non-inverting summing amplifiers is false?
the differential input voltage of a saturated circuit is held at 0V.
Based on the operating principles of a non-inverting summing amplifier
the differential input voltage of the op amp is 0V, the (-) and (+) terminals of the op amp are equal in voltage, the (-) terminal of the op amp need not be at virtual ground.
Which statement applies to a voltage follower circuit configuration?
the output terminal of the op amp is shorted to the inverting terminal.
Which statement about a voltage follower is false?
the ratio between the circuit feedback and input resistors must equal 1
On the inverting amplifier, the summing junction is at
virtual ground
When two equal signals are applied to the inputs of a balanced closed-loop op amp circuit, the signal is what?
zero