Analog circuits miscellaneous

Analog circuits miscellaneous

Easy Questions
Moderate Questions

Analog Circuits

Analog circuits miscellaneous
  1. If differential amplifier has a differential gain of 20,000. CMRR = 80 dB, then common mode gain is








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    20 log
    Ad
    		 = 80
    Ac

    ⇒
    Ad
    		 = 104
    Ac

    ⇒
    Ad
    		 = Ac
    104

    ⇒ Ac =
    2 × 104
    		 = 2
    104

    Correct Option: A

    20 log
    Ad
    		 = 80
    Ac

    ⇒
    Ad
    		 = 104
    Ac

    ⇒
    Ad
    		 = Ac
    104

    ⇒ Ac =
    2 × 104
    		 = 2
    104

  1. In the OP-AMP circuit shown in the given figurs V0 is given by









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    V0
    		 =
    3R
    		 = 3
    VsR

    ⇒ V0 = 3Vs

    Correct Option: C

    V0
    		 =
    3R
    		 = 3
    VsR

    ⇒ V0 = 3Vs

  1. OPAMP used as a tuned amplifier has the tuned circuit connected








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    NA

    Correct Option: C

    NA

  1. For the circuit shown in the given figure, assuming ideal diodes, output waveform V0 will be








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    Voltage at OP-AMP output
    V1 = – 1– 5 sin ωt

    At ωt =
    π
    		 , V0 = -6 volts
    2

    At ωt =
    3π
    		 , V0 = 4 volts
    2

    During ‘– ’ ve cycl e of t he waveform, when VI <– 2V, diode D2 conducts and V0 = – 2V
    During ‘+’ ve cycle, when V1 > 2V, D1 conducts and V0 = 2V.

    Correct Option: D

    Voltage at OP-AMP output
    V1 = – 1– 5 sin ωt

    At ωt =
    π
    		 , V0 = -6 volts
    2

    At ωt =
    3π
    		 , V0 = 4 volts
    2

    During ‘– ’ ve cycl e of t he waveform, when VI <– 2V, diode D2 conducts and V0 = – 2V
    During ‘+’ ve cycle, when V1 > 2V, D1 conducts and V0 = 2V.

  1. Out put of the OPAMP shown below will be (assuming it to be ideal)










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    NA

    Correct Option: D

    NA