Assuming ideal op-amps, the circuit represents a

The op-amps in the following circuit are ideal. The voltage gain of the circuit is ________ (round off to the nearest integer).

A difference amplifier is shown in the figure. Assume the op-amp to be ideal. The CMRR (in ) of the difference amplifier is ________ (rounded off to 2 decimal places).

Consider the OP AMP based circuit shown in the figure. Ignore the conduction drops of diodes  and . All the components are ideal and the breakdown voltage of the Zener is . Which of the following statements is true?

The steady State output  of the circuit shown below, will                 

The output impedance of a non-ideal operational amplifier is denoted by  The variation in the magnitude of  with increasing frequency, f, in the circuit shown below, is best represented by         

The current gain  in the circuit with an ideal current amplifier given below is

A CMOS Schmitt-trigger inverter has a low output level of 0 V and a high output level of 5 V. It has input thresholds of 1.6 V and 2.4 V. The input capacitance and output resistance of the Schmitt-trigger are negligible. The

frequency of the oscillator shown is ______________ Hz.

(Round off to 2 decimal places.)        

In the circuit below, the operational amplifier is ideal. If  and , the output voltage () is        

The op-amp shown in the figure is ideal. The input impedance is given by

The approximate transfer characteristic for the circuit shown below with an ideal operational amplifier and diode will be         

For the circuit shown below, assume that the OPAMP is ideal         

The circuit shown below is an example of a

For the circuit shown below, taking the opamp as ideal, the output voltage  in terms of the input voltages ,  and  is

Of the four characteristics given below, which are the major requirements for an instrumentation amplifier?

P. High common mode rejection ratio

Q. High input impedance.

R. High linearity.

S. High output impedance.

Consider the circuit shown in the figure. In this circuit   and . The input voltage is sinusoidal with a frequency of 50Hz, represented as a phasor with magnitude  and phase angle 0 radian as shown in the figure. The output voltage is represented as a phasor with magnitude and phase angle  radian. What is the value of the output phase angle  (in radian) relative to the phase angle of the input voltage?

The op – amp shown in the figure has a finite gain A = 1000 and an infinite input resistance. A step voltage  is applied at the input at time t=0 as shown. Assuming that the operational amplifier is not saturated, the time constant (in millisecond) of the output voltage   is

The operational amplifier shown in the figure is ideal. The input voltage (in Volt) is , The amplitude of the output voltage  (in Volt) is____________.        

The saturation voltage of the ideal op – amp shown below is ±10V. The output voltage  of the following circuit in the steady – state is

Given that the op – amps in the figure are ideal, the output voltage  is                 

An oscillator circuit using ideal op-amp and diodes is shown in the figure.        

The time duration for +ve part of the cycle is  and for –ve part is . The value of  will be ____________.

An operational-amplifier circuit is shown in the figure

The output of the circuit for a given input  is

The transfer characteristic of the op-amp circuit shown in figure is                

In the circuit shown below what is the output voltage  in Volts if a silicon transistor Q and an ideal op-amp are used?        

In the circuit shown below the op-amps are ideal. Then  in Volts is

The circuit shown is a         

A low-pass filter with a cut-off frequency of 30Hz is cascaded with a high-pass filter with a cut-off frequency of 20Hz. The resultant system of filters will function as

For the circuit shown below,        

The correct transfer characteristics is

Given that the op-amp is ideal, the output voltage  is                 

The following circuit has R = 10kΩ, C = 10µF.  The input voltage is a sinusoid at 50Hz with an RMS value of 10V. Under ideal conditions, the current  from the source is

An ideal op-amp circuit and its input waveform are shown in the figures. The output waveform of this circuit will be                 

A waveform generator circuit using OPAMPs is shown in the figure. It produces a triangular wave at point ‘P’ with a peak to peak voltage of 5 V for.        

If voltage is made +2.5V, the voltage waveform at point ‘P’ will become

A general filter circuit is shown in the figure:

If and , the circuit acts as a  

A general filter circuit is shown in the figure:

The output of the filter is given to the circuit shown in figure:

The gain vs frequency characteristic of the output  will be

The circuit shown in the figure is

The switch S in the circuit of the figure is initially closed. It is opened at time t = 0.  You may neglect the Zener diode forward voltage drops. What is the behavior of  for t > 0?

For a given sinusoidal input voltage, the voltage waveform at point P of the clamper circuit shown in figure will be

The parameters of the circuit shown in the figure are.  If , then output voltage, input impedance and output impedance respectively are

A relaxation oscillator is made using OPAMP as shown in figure. The supply voltages of the OPAMP are ±12V. The voltage waveform at point P will be

Consider the inverting amplifier, using an ideal operational amplifier shown in Figure. The designer wishes to realize the input resistance seen by the small signal source to be as large as possible, while keeping the voltage gain between –10 and –25, the upper limit on  is 1 MΩ. The value of  should be

In Figure if the input is a sinusoidal signal, the output will appear as shown in                

In the active filter circuit shown in figure, if Q=1, a pair of poles will be realized with  equal to         

The input resistance  of the circuit in figure is                 

For the circuit of Figure with an ideal operational amplifier, the maximum phase shift of the output with reference to the input is

Assuming the operational amplifier to be ideal, the gain  for the circuit shown in Figure is        

A first order, low pass filter is given with  and . What is the frequency at which the gain of the voltage transfer function of the filter is 0.25?

The output voltage of the Schmitt trigger shown in Figure swings between +15V and –15V. Assume that the operational amplifier is ideal. The output will change from +15V to –15V when the instantaneous value of the input sine wave is

Determine the transfer function  for the RC network shown in Figure (a). This network is used as a feedback circuit in an oscillator circuit shown in Figure (b) to generate sinusoidal oscillations. Assuming that the operational amplifier is ideal, determine  for generating these oscillations. Also, determine the oscillation frequency if  and C =100pF.

An op-amp has an open-loop gain of  and an open-loop upper cutoff frequency of 10 Hz.  If this op-amp is connected as an amplifier with a closed gain of 100, then the new upper cutoff frequency is

For the oscillator circuit shown in figure, the expression for the time period of oscillation can be given by (where τ = RC) 

An op-amp having a slew rate of 62.8 V/µsec, is connected in a voltage follower configuration.  If the maximum amplitude of the input sinusoid is 10V, then the minimum frequency at which the slew rate limited distortion would set in at the output is

For the op-amp circuit shown in figure, determine the output voltage .  Assume that the op-amps are ideal.

A simple active filter is shown in Figure.  Assume ideal op-amp. Derive the transfer function  of the circuit, and state the type of the filter (i.e., high-pass, low-pass, band-pass, or band-reject).  Determine the required values of ,  and C in order for the filter to have a 3-dB frequency of 1 kHz, a high frequency input resistance of 100 kΩ, and a high frequency gain magnitude of 10.

The circuit shown is fig. uses an ideal op-amp working +5V and -5V power supplies. The output voltage  is equal to

The feedback factor for the circuit shown in fig. is:

An active filter consisting of an op-amp, resistors  and two capacitors of value C each, has a transfer function         

Where  

If  and , determine the center frequency , gain  and the Q of the filter.

The input voltage  in the circuit shown in fig is a 1 kHz sine wave of 1V amplitude. Assume ideal operational amplifiers with  supply. Sketch on a single diagram the waveforms of the voltages and  shown, indicating the peak value of  and the average value  

Match the column                 

Circuit

(a)        (P) High-pass filter

(b)                 (Q) Amplifier

(c)         (R) Comparator

                        (S) Low-pass filter

In the circuit shown in fig and, . For the op-amp, , R1 = 100 kΩ and R0 = 50Ω. For V0 = 10V, calculate  and  and estimate the input resistance of the circuit                

Show that the circuit given in figure will work as an oscillator at , if ?

A major advantage of active filters is that they can be realized without using

A differentiator has transfer function whose

The circuit shown in figure, acts as a… and for the given inputs, its output voltage is… V         

For an input signal 4sin10t, the voltage across the resistance R in the circuit shown in figure, is … V

Determine the frequency of oscillation of the circuit shown in figure. Assume the op-amp to be ideal

A non-inverting Op-Amp amplifier is shown in figure. The output voltage  is         

Let the magnitude of the gain in the inverting OP-Amp amplifier circuit shown in be x with switch S1 open. When the switch S1 is closed the magnitude of gain becomes

The common mode voltage of a unity gain (voltage follower) op-amp buffer in terms of its output voltage   is . ( True=1, False=0)

For the circuit shown in figure, determine  and hence write the equations for the magnitude and phase response of . If the value of  is 100k Ohm and of R is 10k Ohm, determine the value of C to obtain a phase shift to 270° between  and  for an input frequency of 1000rad/s.

For the circuit shown in figure, determine the input impedance Z. assume the op-amp to be an ideal one.

An analog comparator is a high-gain amplifier whose output is always either in positive or in negative saturation. (True=1, False=0)

Given figure shows a two-stage small signal transistor feedback amplifier. Match the defective component (listed on the left hand side below) with its probable effect on the circuit (listed on the right hand side below)

(a) Capacitor  is open

(b) Capacitor  is open

(c) Capacitor  is open

(d)  is shorted

(P) All dc voltages normal,  increases marginally

(Q) Collector of  is at ,

(R) All dc voltages normal, gain of  stage increase  decrease

(S) All dc voltages normal,

(T) All dc voltages normal, overall gain of the amplifier increases,  increases

(U) No change

Given figure, shows a non-inverting op-amp summer with  and . The output voltage   __________________

An ideal OPAMP is used to make an inverting amplifier. The two input terminals of the OP-AMP are at the same potential because

The circuit shown in figure is excited by the input shown in the figure. Sketch the waveform of the output also indicating the salient values. Assume all components to be ideal.

In the following circuit (figure.), the output V follows an equation of the form                

Find a, b and f(t).

With ideal operational amplifiers, the circuit in figure simulates the output equation

In figure shown, assume the Zener diode and the operational amplifier to be ideal.        

( gain  )