BJT Differential Amplifier

  • #1

Homework Statement


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].

Homework Equations




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
 

Answers and Replies

  • #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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