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    Ec-II I Assignment

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    ramesh471
    This document contains a 6 question assignment on electronics and communications. The questions cover topics like: 1) calculating voltage gain with and without Miller's theorem for a hybrid-Pi circuit, 2) determining source resistance values to achieve certain voltage gain-bandwidth products, 3) deriving voltage gain expressions for an emitter follower, and 4) using Miller's theorem and hybrid-Pi models to calculate voltage and current gains. The final two questions involve proving expressions for internal voltage gain and 3-dB frequency of a single stage CE amplifier with a load resistor shunted by a capacitor.

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    © All Rights Reserved
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    Ec-II I Assignment

    Uploaded by

    ramesh471
    145 views2 pages
    This document contains a 6 question assignment on electronics and communications. The questions cover topics like: 1) calculating voltage gain with and without Miller's theorem for a hybrid-Pi circuit, 2) determining source resistance values to achieve certain voltage gain-bandwidth products, 3) deriving voltage gain expressions for an emitter follower, and 4) using Miller's theorem and hybrid-Pi models to calculate voltage and current gains. The final two questions involve proving expressions for internal voltage gain and 3-dB frequency of a single stage CE amplifier with a load resistor shunted by a capacitor.

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    ELECTRONIC CIRCUITS

    Original Title

    Ec-II i Assignment

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    This document contains a 6 question assignment on electronics and communications. The questions cover topics like: 1) calculating voltage gain with and without Miller's theorem for a hybrid-Pi circuit, 2) determining source resistance values to achieve certain voltage gain-bandwidth products, 3) deriving voltage gain expressions for an emitter follower, and 4) using Miller's theorem and hybrid-Pi models to calculate voltage and current gains. The final two questions involve proving expressions for internal voltage gain and 3-dB frequency of a single stage CE amplifier with a load resistor shunted by a capacitor.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    145 views2 pages

    Ec-II I Assignment

    Uploaded by

    ramesh471
    This document contains a 6 question assignment on electronics and communications. The questions cover topics like: 1) calculating voltage gain with and without Miller's theorem for a hybrid-Pi circuit, 2) determining source resistance values to achieve certain voltage gain-bandwidth products, 3) deriving voltage gain expressions for an emitter follower, and 4) using Miller's theorem and hybrid-Pi models to calculate voltage and current gains. The final two questions involve proving expressions for internal voltage gain and 3-dB frequency of a single stage CE amplifier with a load resistor shunted by a capacitor.

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    © All Rights Reserved
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    BAPATLA ENGINEERING COLLEGE::BAPATLA(AUTONOMOUS)

    ELECTRONICS AND COMMUNICATIONS


    I ASSIGNMENT
    TIME:40MIN
    SECTION:A,B,C MAXIMUM MARKS:10

    ONE MARKS QUESTIONS

    1. Consider the hybrid-Π circuit, so that 𝐶𝑒 , 𝐶𝑐 may be neglected. Omit the none other elements
    𝑉𝑐𝑒
    in circuit. If the load resistance is 𝑅𝐿 ,calculate with and without millers theorem.
    𝑉𝑏′𝑒

    2. A single stage CE amplifier with typical hybrid-𝛱 values.What value of source resistance will
    give a 3-dB frequency 𝑓𝐻 which give a) half value for 𝑅𝑠 =0, b) twice the value for 𝑅𝑠 =∞ does
    these values depends on load resistance

    3. A single stage CE amplifier is measured to have voltage gain-bandwidth 𝑓𝐻 of 5MHz with


    𝑅𝐿 =500Ω.Assume ℎ𝑓𝑒 =100, 𝑔𝑚 =100mA/v, 𝑟𝑏𝑏′ =100Ω,𝐶𝑐 =1PF,𝑓𝑇 =400MHz.

    a) Find the value of source resistance that will give required bandwidth

    𝑉𝑜
    b) With the value found in part a find midband voltage gain ⁄𝑉
    𝑠

    4. Derive voltage gain for emitter follower circuit at high frequencies using exact analysis.

    5. For circuit shown Using miller’s theorem and approximated analysis compute the following
    using hybrid-Π parameter model.

    a) Upper 3-dB frequency of current gain 𝐴𝐼 = 𝐼𝐿 /𝐼𝐼

    b) The magnitude of the voltage gain 𝐴𝑣𝑠 = 𝑣𝑜 /𝑣𝑠


    BAPATLA ENGINEERING COLLEGE::BAPATLA(AUTONOMOUS)
    ELECTRONICS AND COMMUNICATIONS
    I ASSIGNMENT
    TIME:40MIN
    SECTION:A,B,C MAXIMUM MARKS:10

    6. Consider a single stage CE amplifier with the load resistor RL shunted by a capacitance CL.
    𝑉
    a) Prove that the internal voltage gain 𝐾 = 𝑉 𝑐𝑒 is
    𝑏′𝑒

    −𝑔𝑚 𝑅𝐿
    𝐾=
    1 + 𝑗𝜔(𝐶𝑐 + 𝐶𝐿 )𝑅𝐿

    b) Prove that the 3-dB frequency is given by

    1
    𝑓𝐻 =
    2𝜋(𝐶𝑐 + 𝐶𝐿 )𝑅𝐿

    Provided that the following condition is satisfied:

    𝑔𝑏′ 𝑒 𝑅𝐿 (𝐶𝑐 + 𝐶𝐿 ) ≫ 𝐶𝑒 + 𝐶𝑐 (1 + 𝑔𝑚 𝑅𝐿 )

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