BJT Op-Amp and Feedback Transfer Function

Discussion in 'Homework Help' started by tquiva, Nov 14, 2012.

  1. tquiva

    Thread Starter Member

    Oct 19, 2010
    176
    1
    Hello everyone. Could someone please help me with the following problem?

    I am given the circuit in the following image:
    [​IMG]

    All the BJT transistors, Q1-Q5 are contained within a single CA3096 chip and the output buffer stage is simply a 741 op-amp configured in its unity-gain mode.

    It is assumed that:
    1) _{}VBE-on = 0.7 V for all transistors
    2) The 741 is an ideal op-amp
    3) The dd value of _{}VC5 = 0 V

    Given the above specs, I know that the transfer function is
    A(s) =\frac{wt}{s}
    and _{w}t = \frac{gm}{Cpi + Cmu}

    My question is, do I have the correct approach in obtaining the transfer function? That I need to find for Cpi + Cmu in order to find wt? Or is there another method in doing this?

    Also, does anyone know how I would find the slew rate (SR) for this circuit? I know that SR = \frac{voltage change}{time change}
    But how would I find Δt?

    Any help is greatly greatly appreciated! Thank you.
     
    Last edited: Nov 14, 2012
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