Virtual Labs

Characteristics and parameters of Op-Amp

An Op-Amp is designed in which order

a: Additional gain stage- Differential Amplification stage - low output impedance stage b: Differential Amplification stage- Additional gain stage - low output impedance stage c: Low output impedance stage - Differential Amplification stage - Additional gain stage d: Low output impedance stage - Additional gain stage - Differential Amplification stage

Usually, the voltage gain can be expressed in terms of

a: Volts b: Bel c: Decibel d: None of the above

In differential-mode signals operation of differential amplifier

a: Opposite polarity signals are applied to the inputs b: The gain is one c: The outputs are of different amplitudes d: Only one supply voltage is used

An Op-Amp has an input offset current of 20 nA and input bias current of 80 nA. Find the values of two base currents.

a: 90 nA and 70 nA b: 90 nA and 65 nA c: 70 nA and 54 nA d: 70 nA and 50 nA

The use of negative feedback in an op amp is that it

a: Reduces the voltage gain of an op-amp b: Makes the op amp oscillate c: Increases the input impedance and bandwidth d: Both options a and c

With zero volts on both inputs, an OP-amp ideally should have an output________.

a: Equal to the positive supply voltage b: Equal to the negative supply voltage c: Equal to zero d: Equal to CMRR

A certain non inverting amplifier has Ri of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is ________.

a: 100000 b: 1000 c: 101 d: 100

A voltage follower ________

a: Has a voltage gain of 1 b: Is non inverting amplifier c: Has no feedback resistor d: Has all of these

An Op-Amp amplifier is being used to amplify an input signal to a peak voltage of 100 mV. What is the maximum operating frequency of the amplifier? The slew rate is 0.5 V/µs.

a: 456 kHz b: 572 kHz c: 796 kHz d: 854 kHz

A certain inverting amplifier has a closed loop voltage gain of 25. The op amp has an open-loop voltage gain of 100,000. If an op amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed loop gain

a: Doubles b: Drops to 12.5 c: Remains at 25 d: Increases slightly