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What is the gain of an op amp?

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Description :

What is op amp and its application?

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Description :

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

Answer :

The unity gain bandwidth of an inverting amplifier is 10 MHz What would be the bandwidth if the gain is increased to 10 V/V? A) 100 MHz B) 1 MHz C) 10 MHz D) 1 kHz 

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Description :

Define gain and bandwidth of an amplifier.

Answer :

Bandwidth  The range of frequency over which the voltage gain is equal to or greater than 70.7% of its maximum value Gain: The ratio of output parameter (voltage/ current /power) to the input parameter (voltage/ current /power) of an amplifier is known as gain. It is denoted by a letter A

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Description :

An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is  (1) 141 (2) 92.3 (3) 9.23 (4) 1.41

Answer :

An amplifier has a voltage gain of 120. To reduce distortion, 10% negative feedback is employed. The gain of the amplifier with feedback is 9.23

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Description :

The gain of an ideal amplifier must be

Answer :

The gain of an ideal amplifier must be infinity

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Description :

The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

Answer :

The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit

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Description :

A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28 

Answer :

A differential amplifier has a differential gain of 28000 and CMRR is 60 dB. What will be the value of common mode gain? A) Ac = 0.125 B) Ac = 0.33 C) Ac = 3 D) Ac = 28 

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Description :

What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

Answer :

What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

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Description :

What is Mason's gain formula?

Answer :

Mason's Gain Formula

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Description :

What is the current gain?

Answer :

Current gain β = Ic/Ib

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Description :

What is operational amplifier?

Answer :

Operational amplifier is an amplifier which amplifies the input signal when we pass a low voltage signal .It has two terminals inverting and non inverting. It is an active device because it ... of negative feedback it provides the output waveform similar to the input waveform (truely amplified )

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Description :

 If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55  

Answer :

 If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be 0.98 

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Description :

A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by

Answer :

A differential amplifier has a differential gain of 20,000, CMRR : 80 dB. The common mode gain is given by 2

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Description :

A transfer function has a second order denominator and constant gain in the numerator

Answer :

A transfer function has a second order denominator and constant gain in the numerator the system has two zeros at infinity

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Description :

The voltage gain of a common -source JFET amplifier depends up on its  (1) Input impedance (2) Amplification factor (3) Dynamic drain resistance (4) Drain load resistance

Answer :

2

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Description :

If the gain of the open loop system is doubled, the gain margin  (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth

Answer :

If the gain of the open loop system is doubled, the gain margin Becomes half

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Answer :

The voltage gain of triode depends on plate voltage.

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Description :

Which configuration has the lowest current gain ?

Answer :

Common base configuration has the lowest current gain.

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Description :

An Op-amp as a voltage follower has a voltage gain of

Answer :

An Op-amp as a voltage follower has a voltage gain of Unity

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Description :

An OP amp has an open loop gain of 1,00,000. If the feedback fraction is 0.02, the approximate closed loop gain is (a) 1 (b) 1,00,000 (c) 50 (d) 0.02

Answer :

The closed loop gain Ag = G/(1+G*f) Where G is the open loop gain and f is the feedback fraction  So Ag = 49.975

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Description :

The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -  a) in inverting mode b) in non -inverting mode c) is independent of the fact whether the input is connected to inverting or non -inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal

Answer :

The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : - is depending upon the fact whether the input is connected to inverting or non -inverting terminal

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Description :

A dominant pole compensated op-amp has openloop gain of 100 dB and -3 dB bandwidth of 50 Hz. If it is connected as inverting amplifier for a gain of 20 dB the -3 dB bandwidth is about  A) 500 kHz B) 50 kHz C) 5 kHz D) 500 Hz

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Description :

Answer :

A non inverting closed loop op amp circuit generally has a gain factor Greater than one.

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Description :

State any two characteristics of an ideal Op-amp.

Answer :

Characteristics of Op-amp: i) Input offset voltage ii) Input offset current iii) Input bias current iv) Differential input resistance v) Input capacitance vi) CMRR-common mode rejection ration vii) ... voltage rejection ratio(SVRR) viii) Output resistance ix) Voltage gain x) Bandwidth xi) Slew rate

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Description :

The input impedance of an op-amp is • High • Low • Medium • None of the above

Answer :

The input impedance of an op-amp is High

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Description :

An OP-AMP can be classified as  1.Linear amplifier 2.Low - Rin amplifier 3.Positive - feedback amplifier 4.RC - coupled amplifier 

Answer :

An OP-AMP can be classified as Low - Rin amplifier

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Description :

An OP amp has a slew rate of 1V/µs. At a signal frequency of 0.1 MHz, the maximum undistorted sine wave amplitude is (a) 8V (b) 4.82 V (c) 2.02 V (d) 1.592 V

Answer :

Slew rate = 2πfv where v is the amplitude V=(1/2π*0.1) = 1.592V

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Description :

The input voltage to an OP AMP is a large voltage step. The output is an exponential waveform that changes to 0.25 V in 0.1µs (microsecond). The slew rate of the OP AMP is : -  a) 5V/µs b) 2.5 V/ µs c) 3V/µs d) 4.5V/ µs

Answer :

The input voltage to an OP AMP is a large voltage step. The output is an exponential waveform that changes to 0.25 V in 0.1µs (microsecond). The slew rate of the OP AMP is : - 2.5 V/ µs

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Description :

 In an electronic ohmmeter an op -amp is used as a: -  a) sommer b) multiplier c) buffer amplifier d) integrator

Answer :

 In an electronic ohmmeter an op -amp is used as a: -  buffer amplifier

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Description :

An ideal Op Amp has  (a) infinite input and output impedance (b) very low input and output impedance (c) low input impedance and very high output impedance (d) infinite input impedance and zero output impedance

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Description :

An op-amp can be represented by  A) Norator at input and Nullator at output B) Norator at output and Nullator at input C) Norator at input and output D) Nullator at input and output

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Description :

Output of an op-amp is a square wave of 4 V peak to peak with a rise time of 5 microsecond and fall time of 4 microsecond.Maximum frequency (in kHz)of undistorted sine wave output of 2 V peak to peak is about  A) 100 B) 150 C) 200 D) 250

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Description :

An op-amp having a slew rate of 62.8 V/msec, is connected in a voltage follower configuration. If the maximum amplitude of the sinusoidal input is 10 V, then the minimum frequency at which the slew rate limited distortion would set in at the output is  (A) 1 MHz (B) 6.28 MHz (C) 10 MHz (D) 62.8 MHz

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Description :

Answer :

In an op-amp differentiator the amplitude of output is proportional to rate of change of input.

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Answer :

If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will Be virtual ground.

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Description :

Answer :

An ideal Op-amp is an ideal voltage controlled voltage source.

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Description :

What is the Output voltage of Op-amp for input voltage of Vi1=150 μV,Vi2=140 μV if the amplifier has differential gain of Ad=4000 and value of CMRR is 100. 

Answer :

i don know

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Description :

Describe how Op-Amp is used as adder using circuit diagram and output voltage equation.

Answer :

Summing Amplifier Circuit In this simple summing amplifier circuit, the output voltage, ( Vout ) now becomes proportional to the sum of the input voltages, V1, V2, V3, etc. Then we can ... to the non-inverting input of the op-amp, it will produce the positive sum of the input voltages.

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Description :

Draw pin diagram of Op-Amp IC-741.

Answer :

Pin diagram of Op-Amp IC-741 :

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Description :

Why there is decrease in supply voltage with increase in drain current in voltage controlled current source circuit using op amp and mosfet?

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Description :

Explain the function of sample and hold circuit by using op-amp.

Answer :

sample and hold circuit by using op-amp The n-channel MOSFET is driven by a control voltage VC acts as a switch. The control voltage VC is applied to the gate of the MOSFET ... called sample period. The time period during which the voltage across capacitor is constant is called Hold period.

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Description :

Describe the concept of virtual ground with reference to op-Amp.

Answer :

Virtual ground concept:-In circuit point A is virtual ground. Figure shows inverting amplifier using op-amp. In this circuit non-inverting terminal is connected to the actual ground. Due to ... zero potential without actually grounding is known as virtual ground concept. Circuit diagram: 

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Description :

Block Diagram of op-Amp

Answer :

Block Diagram: The OP-AMP is basically a different amplifier i.e. it will amplify the voltage which is differentially present between its input terminals.  1.Input stage: The ... normally a complementary output stage. It increases the OPAMP. It also provides a low output resistance. 

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Description :

Define the following terms related to Op-Amp: i) CMRR ii) SVRR

Answer :

Definition:- i) SVRR: It is defined as the ratio of change of input offset voltage to the change in one supply voltage while keeping other supply voltage constant. Ideally,SVRR=0  ii)CMMR:-The ... gain should exceed common-mode gain, this will be a positive number, and the higher the better.

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Description :

Draw and explain the Op-amp based subtractor

Answer :

Working The subtractor circuit is a basic op-amp circuit whose output voltage is the difference between two input voltages.  In the above circuit, the two input voltages are V1 and V2.  The op amp is used ... When differential gain is 1, ie Rf = R,  the output voltage is Vo = (V2 - V1).

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Description :

Draw the diagram of zero crossing detector using op-amp and explain its working.

Answer :

The zero crossing detector circuit is an important application of the op-amp comparator circuit. It can also be called as the sine to square wave converter. Anyone of the inverting or non-inverting ... the possibility of any false zero crossing due to noise voltages at the op-amp input.

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Description :

In op-amp operation, Common Mode Rejection Ratio (CMRR)

Answer :

In op-amp operation, Common Mode Rejection Ratio (CMRR) is desired to be high

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Description :

In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip

Answer :

In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the internal compensation

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Description :

The type number CA3741 operational amplifier(op-amp) is manufactured by  A) RCA B) Texas instruments C) Signetics D) Motorola

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Description :

What do you mean by frequency response of an amplifier?

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