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