1
GATE ECE 2022
MCQ (More than One Correct Answer)
+1
-0.33

An ideal OPAMP circuit with a sinusoidal input is shown in the figure. The 3 dB frequency is the frequency at which the magnitude of the voltage gain decreases by 3 dB from the maximum value. Which of the options is/are correct?

A
The circuit is a low pass filter.
B
The circuit is a high pass filter.
C
The 3 dB frequency is 1000 rad/s.
D
The 3 dB frequency is $${{1000} \over 3}$$ rad/s.
2
GATE ECE 2022
+1
-0.33

A circuit with an ideal OPAMP is shown. The Bode plot for the magnitude (in dB) of the gain transfer function (Av(j$$\omega$$) = Vout(j$$\omega$$)/Vin(j$$\omega$$)) of the circuit is also provided (here, $$\omega$$ is the angular frequency in rad/s). The values of R and C are __________.

A
R = 3 k$$\Omega$$, C = 1 $$\mu$$F
B
R = 1 k$$\Omega$$, C = 3 $$\mu$$F
C
R = 4 k$$\Omega$$, C = 1 $$\mu$$F
D
R = 3 k$$\Omega$$, C = 2 $$\mu$$F
3
GATE ECE 2017 Set 1
+1
-0.3
For the operational amplifier circuit shown, the output saturation voltages are $$\pm \,\,15V$$. The upper and lower threshold voltages for the circuit are, respectively.
A
+5 V and -5V
B
+7 V and -3V
C
+3V and -7V
D
+3V and -3V
4
GATE ECE 2016 Set 1
+1
-0.3
Consider the constant current source shown in the figure below. Let $$\beta$$ represent the current gain of the transistor

The load current I0 through RL is

A
$${I_0} = \left[ {{{\beta + 1} \over \beta }} \right]{{{V_{ref}}} \over R}$$
B
$${I_0} = \left[ {{\beta \over {\beta + 1}}} \right]{{{V_{ref}}} \over R}$$
C
$${I_0} = \left[ {{{\beta + 1} \over \beta }} \right]{{{V_{ref}}} \over {2R}}$$
D
$${I_0} = \left[ {{\beta \over {\beta + 1}}} \right]{{{V_{ref}}} \over {2R}}$$
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