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BJT Differential Amplifier

  1. Feb 28, 2016 #1
    1. The problem statement, all variables and given/known data
    diff amp.PNG

    Analyse the circuit to provide predictions for (a) the differential input resistance, (b) differential voltage gain, (c) single-ended voltage gain, (d) common-mode voltage gain, (e) common-mode rejection ratio (CMRR) in dB, (f) common-mode input resistance and (g) the single-ended output resistance. The common-mode gain may be calculated using the output admittance (hOE) in Fig. 6 in the CA3086 data sheet. [ro = 1 / hOE].

    2. Relevant equations


    3. The attempt at a solution

    For a) is the differential input resistance just
    Rid = Rib + R3, where Rib is the resistance looking into the base

    Rib = ie(re + R6/2)/ib
     
  2. jcsd
  3. Feb 29, 2016 #2
    that is a question indeed !!!...but I think this might not be the forum for this kind of question...try in electrical.stackexchange
     
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