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Analog circuits...

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  • Question 1
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    If a C.E. stage with early effect has a load Rl and transconductance gm, what is the factor by which the capacitance between the base and the collector at the output side, gets multiplied?

  • Question 2
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    In CE configuration, effect of bypass capacitor is/are ______

  • Question 3
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    For a high frequency response of a simple C.E. stage with a transconductance of gm, what is Cout?

  • Question 4
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    Which parasitic capacitors don’t affect the frequency response of the C.B. stage of the B.J.T.?

  • Question 5
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    If the transconductance of the B.J.T increases, the transit frequency ______

  • Question 6
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    In Miller’s theorem, what is the constant K?

  • Question 7
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    Find net voltage gain, given hfe = 50 and hie = 1kΩ.

  • Question 8
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    Consider an RC coupled amplifier at low frequency. Internal voltage gain is -120. Find the voltage gain magnitude, when given that collector resistance = 1kΩ, load = 9kΩ, collector capacitance is 0. is 0.1μF, and input frequency is 20Hz.

  • Question 9
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    Given collector resistance = 2kΩ, load resistance = 5kΩ, collector capacitance = 1μF, emitter capacitance = 20μF, collector current = 2mA, source resistance = 2kΩ. If the effect of blocking capacitor is ignored, find the applicable cut-off frequency.

  • Question 10
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    What is the phase shift in RC coupled CE amplifier at lower 3dB frequency?

  • Question 11
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    When applying miller’s theorem to resistors, resistance R1 is for node 1 and R2 for node 2. If R1>R2, then for same circuit, then for capacitance for which the theorem is applied, which will be larger, C1 or C2?

  • Question 12
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    Given that capacitance w.r.t the input node is 2pF and output node is 4pF, find capacitance between input and output node.

  • Question 13
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    Find the 3-dB frequency given that the gain of RC coupled amplifier is 150, the low frequency voltage gain is 100 and the input frequency is 50Hz.

  • Question 14
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    Consider the circuit shown.

  • Question 15
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    Consider that the phase shift of an RC coupled CE amplifier is 260°. Find the low frequency gain when the voltage gain of the transistor is -150.

  • Question 16
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    In the low pass filter shown in the figure for a cut-off frequency of 5 KHz, the value of R2 (in kΩ) is

  • Question 17
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    If channel length modulation is present, what is the voltage gain?

  • Question 18
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    The output impedance of the follower is _______

  • Question 19
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    Assume µnCox = 100 µA/V2 and supply current is 5mA, what should be the aspect ratio so that a 50 Ω load can be used to give a voltage gain of .25 in C.D. configuration?

  • Question 20
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    If channel length modulation is present, what is the impedance looking into node X?

  • Question 21
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    The follower stage provides _____ input impedance.

  • Question 22
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    The follower stage is mostly used as a ____________

  • Question 23
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    If maximum power is transferred to the load R1, the transconductance is .02 and channel length modulation is neglected, what should be the value of the load?

  • Question 24
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    Neglecting Channel Length Modulation, if the transconductance of the MOSFET increases, the gain of the follower stage will _________

  • Question 25
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    A Half wave rectifier uses a capacitor of 680 μF in parallel to a load of 2kΩ. The average output voltage is 40 V and the line frequency is 60 Hz.

    Which of the following is/are true? 

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