Which of the following statements is/are TRUE with respect to an ideal opamp?

All the components in the bandpass filter given below are ideal. The lower -3 dB frequency of the filter is 1 MHz.

The upper -3 dB frequency (in MHz, rounded off to the nearest integer) is _________.

A 4-bit weighted-resistor DAC with inputs , and  (MSB to LSB) is designed using an ideal opamp, as shown below. The switches are closed when the corresponding input bits are logic ' 1 ' and open otherwise.

When the input  changes from 1110 to 1101, the magnitude of the change in the output voltage , rounded off to the nearest integer) is ___________ .

The opamps in the circuit shown are ideal, but have saturation voltages of .

Assume that the initial inductor current is . The input voltage  is a triangular signal with peak voltages of  and time period of . Which one of the following statements is true?

The  of the circuit shown below is

An ideal OPAMP circuit with a sinusoidal input is shown in the figure. The  frequency is the frequency at which the magnitude of the voltage gain decreases by  from the maximum value. Which of the options is/are correct?

For the following circuit with an ideal OPAMP, the difference between the maximum and the minimum values of the capacitor voltage  is __________             

A circuit with an ideal OPAMP is shown. The Bode plot for the magnitude (in  ) of the gain transfer function  of the circuit is also provided (here,  is the angular frequency in . The values of R and  are ________.        

For the circuit with an ideal Op-Amp shown in the figure,  is fixed.        

If  Volt for  Volt and  Volt for  Volt, where  is measured across  connected at the output of this Op-Amp, the value of  is

Consider the circuit with an ideal Op-Amp shown in the figure.

Assuming  and , the condition at which  equals to zero is

A circuit with an ideal Op-Amp is shown in the figure. A pulse  of  duration is applied to the input. The capacitors are initially uncharged.

The output voltage  of this circuit at (in integer) is ________ V.

In the circuit shown below, all the components are ideal. If  is , the current  sourced by the op-amp is _______ .

The components in the circuit given below are ideal. If  and , the cut-off frequency of the circuit in Hz is        

In the circuit shown below, the op-amp is ideal and Zener voltage of the diode is 2.5 volts. At the input, unit step voltage is applied. i.e.volts. Also, at t =0, the voltage across each of the capacitors is zero.

The time t, in milliseconds, at which the output voltage, crosses -10 V is

An op-amp based circuit is implemented as shown below.        

In the above circuit, assume the op-amp to be ideal. The voltage (m volts, coned to one decimal place) at node A, connected to the negative input of the op-amp as indicated in the figure is _______

For the operational amplifier circuit shown, the output saturation voltages are . The upper and lower threshold voltages for the circuit are, respectively,

A good transconductance amplifier should have

The amplifier circuit shown in the figure is implemented using a compensated operational amplifier (op-amp), and has an open-loop voltage gain,  and an open-loop cut-off frequency, . The voltage gain of the amplifier at 15 kHz, in V/V, is _______________ .

Consider the constant current source shown in the figure below. Let's β represent the current gain of the transistor. The load current  through  is         

The following signal  of peak voltage 8 V is applied to the non-inverting terminal of an ideal op-amp. The transistor has  and .        

The number of times the LED glows is________________

An ideal op-amp has voltage sources connected to the non-inverting input and connected to the inverting input as shown in the figure below . The voltages ,.... are 1, - 1/2, 1/3, -1/4, 1/5, -1/6,.... volt, respectively. As N approaches infinity, the output voltage (in volt) is_________.

A PIN photodiode of responsivity 0.8A/W is connected to the inverting input of an ideal op-amp as shown in the figure,  Load resistor  If 10μW of power is incident on the photodiode, then the value of the photocurrent (in μA) through the load is_______________.        

An op-amp has a finite open loop voltage gain of 100. Its input offset voltage  is modelled as shown in the circuit below. The amplifier is ideal in all other respects.  is 25mV.        

The output voltage (in milli volts) is ________.         

For the circuit shown in the figure, , L = 1μH and C =1μF. If the input, then the overall voltage gainof the circuit is _________.        

In the circuit shown, assume that the op-amp is ideal. The bridge output voltage  for δ = 0.05 is _______.

In the circuit shown,  for switch SW in position A and  for SW in position B. Assume that the op-amp is ideal. The value of  is ___________.

Assuming that the op-amp in the circuit shown below is ideal, the output voltage  (in volts) is_______.

For the voltage regulator circuit shown, the input voltage  is 20 V ± 20% and the regulated output voltage is 10 V. Assume the op-amp to be ideal. For a load  drawing 200mA, the maximum power dissipation in  (in Watts) is ________.        

In the ac equivalent circuit shown in the figure if  is the input current and  is very large, the type of feedback is

In the circuit shown, the op-amp has finite input impedance, infinite voltage gain and zero input offset voltage. The output voltage is

In the low-pass filter shown in the figure, for a cut-off frequency of 5kHz, the value of (in kΩ) is _____________.

In the voltage regulator circuit shown in the figure, the op-amp is ideal. The BJT has  and β = 100, and the zener voltage is 4.7 V. For a regulated output of 9 V, the value of R (in Ω) is _______        

Assuming that the Op-amp in the circuit shown is ideal,  is given by        

The circuit shown represents

In the circuit shown using an ideal op-amp, the 3-dB cut-off frequency (in Hz) is _______         

In the circuit shown, assume that the op-amp is ideal. If the gainis –12, the value of R (in kΩ) is _____.        

In the circuit shown below what is the output voltage  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        

The circuit below implements a filter between the input current  and the output voltage. Assume that the op-amp is ideal. The filter implemented is a

Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown below is

The transfer characteristic for the precision rectifier circuit shown below is (assume ideal OP-AMP and practical diodes)

In the circuit shown below, the op-amp is ideal, the transistor has  and . Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the op-amp.

Consider the following circuit using an ideal OPAMP. The I-V characteristics of the diode is described by the relation  where,  and V is the voltage across the diode (taken as positive for forward bias). For an input voltage, the output voltage  is        

The OPAMP circuit shown above represents a

For the Op-Amp circuit shown in the figure, , is

In the Op-Amp circuit shown, assume that the diode current follows the equation . For , and for The relationship between  and is        

Consider the Op-Amp circuit shown in the figure.

The transfer function  is

and, then the minimum and maximum values of (in radians) are respectively

For the circuit shown in the following figure, the capacitor C is initially uncharged. At t = 0, the switch S is closed. The voltage  across the capacitor at

t = 1 millisecond is:

In the figure shown, the OP-AMP is supplied with and the ground has been shown by the symbol

A regulated power supply, shown in figure below, has an unregulated input (UR) of 15 Volts and generates a regulated output. Use the component values shown in the figure.

In the figure above, the ground has been shown by the symbol

The power dissipation across the transistor  shown in the figure is:

A regulated power supply, shown in figure below, has an unregulated input (UR) of 15 Volts and generates a regulated output. Use the component values shown in the figure.

In the figure above, the ground has been shown by the symbol

If the unregulated voltage increases by 20%, the power dissipation across the transistor

The input resistance  of the amplifier shown in figure is

The voltage  indicated in figure has been measured by an ideal voltmeter. Which of the following can be calculated?        

The op-amp circuit shown in figure is a filter. The type of filter and its cut-off frequency are respectively.  

An ideal op-amp is an ideal

The circuit in the figure is a

In the op-amp circuit given in Figure, the load current  is

If the input to the ideal comparator shown in figure is a sinusoidal signal of 8V (peak to peak) without any DC component, then the output of the comparator has a duty cycle of        

The output voltage of the regulated power supply shown in figure is

If the op-amp in the figure is ideal, the output voltage will be equal to        

A 741-type op-amp has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp and having a voltage gain of 20dB will exhibit a 3-dB bandwidth of

An amplifier using an op-amp with a slew-rate

SR = 1V/μsec has a gain of 40dB. If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed.

Consider the circuit of Figure. The op-amp used is ideal.        

(a) In which mode is the BJT operating (i.e. active, saturation or cut-off)? Justify your answer.

(b) Obtain an expression relating the output current  and the input voltage.

(c) Determine  and  if volt  ( : output of OP-AMP)

(Assume β = 99 and )

The ideal OP-AMP has the following characteristics.

The inverting OP-AMP shown in Figure has an open-loop gain of 100. The closed loop gain  is

In Figure, assume the OP-AMPs to be ideal. The output  of the circuit is:

Assume that the OP-AMP in Figure is ideal.

(a) Obtain an expression for  in terms of, R, and the reverse saturation current  of the transistor.

(b) If R = 1Ω,  and the thermal voltage, then what is the value of the output voltage  for an input voltage ?

(c) Suppose that the transistor in the feedback path is replaced by a p-n-junction diode with a reverse saturation current of  The p-side of the diode is connected to node A and the n-side to node B. Then what is the expression for  in terms of, R, ?

In the circuit of Figure,  is        

If the op-amp in Figure, is ideal then, is         

Assume that the op-amp of Figure is ideal. If  is a triangular wave, then  will be

The most commonly used amplifier in sample and hold circuits is

If the OP-AMP in the figure has an input offset voltage of 5mV and an open-loop voltage gain of 10,000, then will be

The first dominant pole encountered in the frequency response of a compensated op-amp is approximately at

Neatly sketch and label the dc transfer characteristic (i.e. ) of the circuit shown in Figure, as  varies from -2V to +2V. Assume ideal op-amp, and the diodes have a forward voltage of 0.6 V and zero incremental resistance.        

One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of comparator will be

Determine the input impedance of the circuit of the figure and investigate if it can be inductive.        

The output voltage  of the circuit shown in the figure is        

Consider the circuit given in the figure is using an ideal operational amplifier.        

The characteristics of the diode are given by the relation

Where  is the forward voltage across the diode

(a) Express  as function of  assuming

(b) If,  and , find the input voltage  for which

In the circuit shown in the figure is assume that the operational amplifier is ideal and that  initially. The switch is connected first to ‘A’ charging  to the voltage V. It is then connected to the point ‘B’. This process is repeated f times per second.

(a) Calculate the charge transferred per second from node A to node B.

(b) Derive the average rate of change of the output voltage.

(c) If the capacitor and the switch are removed and a resistor is connected between points A and B, find the value of the resistor to get the same average rate of change of the output voltage?

(d) If the repetition rate of the switching action is  times per second, ,  and , what is the average rate of change of the output voltage? 

The circuit shown in the figure is that of

In the given circuit the given figure, if the voltage inputs  and  are to be amplified by the same amplification factor, the value of R should be         

An OP-AMP is used as a zero-crossing detector. If the maximum output available from the OP-AMP is  p-p, and the slew rate of the OP-AMP is , then the maximum frequency of the input signal that can be applied without causing a reduction in the p-p output is ______________kHz.

The frequency compensation is used in op-amps to increase its stability. ( True=1, False=0)

For the ideal op-amp circuit of figure shown, determine the outpout voltage  ______V         

Find the output, (V) in the following circuit (figure), assuming that the op-amps are ideal.

An op-amp has an offset voltage of 1mV and is ideal in all other respects. If this op-amp is used in the circuit shown in figure, the output voltage will be (select the nearest value)

The circuit of figure, uses an ideal op amp. For small positive values of , the circuit works as         

Assume that the operational amplifier in figure is ideal. The current I, through the 1K ohm resistor is __________mA.

Consider the circuit shown in the figure. This circuit uses an ideal operational amplifier. Assuming that the impedances at nodes A and B do not load the preceding bridge circuit; calculate the output voltage         

(a) When  ohms

(b) When  ohms and  ohms

In order that the circuit of Figure works properly as differentiator, it should be modified to ____________ (draw the modified circuit)        

Two non-inverting amplifiers, one having a unity gain and the other having a gain of twenty are made using identical operational amplifiers. As compared to the unity gain amplifier, the amplifier with gain twenty has

In figure, the operational amplifier is ideal and its output can swing between -15 and +15 volts. The input  which is zero for , is switched to 5 volts at the instant . Given that the output  is +15 volts for , sketch on the same diagram the waveforms of  and . You must give the values of important parameters of this sketch.

In figure, the operational amplifiers are ideal and their output can swing between -15 and +15 volts. Sketch on same diagram the waveform of voltages and  as a function of time. You must give the values of important parameters of this sketch.