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    Find (a), (b) and (c) in the attached circuit.

    © BrainMass Inc. brainmass.com December 24, 2021, 5:21 pm ad1c9bdddf
    https://brainmass.com/physics/circuits/circuit-elements-43506

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    SOLUTION This solution is FREE courtesy of BrainMass!

    Dear Student,

    Please find your solution attached.

    The diagram given to you is a small signal circuit representation of a BJT ( May be common emitter, I am saying maybe because the terminals are not mentioned)

    You are asked to calculate the io, i1, i2.

    a) To find i0,

    You are given gm = 5 x 10-3
    gm = I0/Iin = Current gain. Note that the Iout and Iin are the DC currents and not the AC currents. You are asked the i0, which is the total current flowing out of the outout terminal. It's so to say the sum of all the AC and DC currents at the outout.

    Iin = Input current = Input Voltage /Input resistance = 200 / (8 + 12) K = 10 m A
    Iout = gm * I in = 5 x 10-3 * 10 x 10 -3 A = 5 x 10 -6 A

    We will come back to calculating the final i0, after solving parts (b) and (c)

    b) And c) To find i1 and i2

    VA = voltage across 12k resistance = 12 K * 10 mA = 12 V

    I1 = 12 V / 9 k = 1.33 mA
    I2 = 12 V / 3 K = 4 mA

    Now i0 = Iout + i1 + i2 = 5 x 10 -6 A + 1.33 x 10 -3 + 4 x 10 -3 = 5.335 mA

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 5:21 pm ad1c9bdddf>
    https://brainmass.com/physics/circuits/circuit-elements-43506

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