Analog electronics circuits miscellaneous

Analog electronics circuits miscellaneous

Easy Questions

Analog Electronic Circuits

Analog electronics circuits miscellaneous
  1. The use of Zener diodes back to back to limit the output voltages in voltage comparators:








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    NA

    Correct Option: B

    NA

  1. The Hysteresis phenomenon in Schmitt trigger has the following features:
    (1) It is due to negative feedback
    (2) Speed of response is achieved
    (3) In the inverted mode, the circuit triggers at a higher voltage for increasing signals than for decreasing signals
    (4) Noise signal voltage greater than VH are cut off, where VH is the hysteresis voltage
    (5) Slowly varying signals are converted to output waveform with abrupt changes at two specified level of input signals
    Of these five statements, the true statements are:








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    NA

    Correct Option: B

    NA

  1. In a Schmitt trigger the output vo is limited by Zener diodes. Single Vs is connected to the negative input terminal (v–) and v+ = β vo. The Hysteresis voltage is 1 volt. Triggering takes place for signals going through:








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    In the schmitt trigger triggering is taken place from
    + Vsat β to – Vsat β
    given that, VH = 1. Also, we know

    VH =
    2R2 Vsat
    R1 + R2

    or VH = 2. β. Vsatβ =
    R2
    R1 + R2

    or β Vsat =
    1
    		= 0.5
    2

    so triggering taken place + 0.5 V to – 0.5 V.
    Hence alternative (D) is the correct choice.

    Correct Option: D

    In the schmitt trigger triggering is taken place from
    + Vsat β to – Vsat β
    given that, VH = 1. Also, we know

    VH =
    2R2 Vsat
    R1 + R2

    or VH = 2. β. Vsatβ =
    R2
    R1 + R2

    or β Vsat =
    1
    		= 0.5
    2

    so triggering taken place + 0.5 V to – 0.5 V.
    Hence alternative (D) is the correct choice.

  1. The output voltage vout of the given circuit, for a given input signal, as shown in the above Figure, will be of the form:










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    The given circuit represents high pass filter, which work as a differentiation. So when we will apply step function to the differentiation, we get impulse output.
    Hence alternative (C) is the correct answer.

    Correct Option: C

    The given circuit represents high pass filter, which work as a differentiation. So when we will apply step function to the differentiation, we get impulse output.
    Hence alternative (C) is the correct answer.

Direction: Consider the circuit shown below:

  1. If Vi = – 2 V, then output V0 is:








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    Given
    Vi = – 2 V
    Vi < 0 then V0 > 0, diode D1 will not conduct while D1 will conduct

    V0 = – Vi
    Rf
    R1

    or V0 = – (– 2).
    3
    		= 3 V
    2


    Correct Option: D

    Given
    Vi = – 2 V
    Vi < 0 then V0 > 0, diode D1 will not conduct while D1 will conduct

    V0 = – Vi
    Rf
    R1

    or V0 = – (– 2).
    3
    		= 3 V
    2