Need help with differential amplifier design

Discussion in 'Homework Help' started by Rumination, Mar 25, 2016.

  1. Rumination

    Thread Starter Member

    Mar 25, 2016
    74
    1
    [​IMG]

    The figure shows a differential amplifier with a differential input vid = (vin_d_pos - vin_d_neg) between the bases of Q1 and Q2, and an output (out) at the emitter of Q4.

    I have to Determine R1, R2, R4, R5 and R6 so that the following requirements are met:

    R 1 = R 2
    Av = vout / vid = 100 [V / V]
    Vout = 0V when Vin_d_pos = Vin_d_neg = 0V.
    The output Vout must be able to deliver undistorted peak signal voltage in the range
    from vout-min to vout-max with RL armed.
    Quiescent current IC = 10 * Q3-Q4 IB

    ----------
    I have been given the values:
    Vcc-pos = 21 V
    Vcc-neg = 21 V
    R3 = 2000 Ohm
    RL = 49 Ohm
    I1 = 3,56 mA
    Vout-max = 8,8 V
    Vout-min = -8,8 V
    ----------
    How can I start? For I have difficulty getting started.
     
  2. Rumination

    Thread Starter Member

    Mar 25, 2016
    74
    1
    Sorry for the double thread. It was a mistake.
     
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