Refer to the Image Attached. Neglect the Early effect (that is, assume r o = ∞) and assume | V BE | = 0.7V. For V A = V B = 0V and neglecting all base currents, design the circuit so that each of Q 1...

Refer to the Image Attached. Neglect the Early effect (that is, assume
r
_o
= ∞) and assume |V
_BE| = 0.7V.

1. ForV
   _A
   =V
   _B
   = 0V and neglecting all base currents, design the circuit so that each ofQ
   ₁ andQ
   ₂ operates at a dc bias current of 0.4 mA,V
   _C
   =V
   _D
   = +10V,V
   _E
   = 0V, andQ
   ₅ operates at a dc bias current of 1.8 mA. Specify the dc bias current at which each ofQ
   ₃ andQ
   ₄ will be operating and give the required values ofR
   ₁,R
   ₂,R
   ₃,R
   ₄, andR
   ₅.


2. Ifβ= 100, what must the value of each of the two resistances labeledR_ebe to obtain an input differential resistance of 54 kΩ?


3. Find the differential voltage gain of the input stage,Q
   ₁−Q
   ₂.


4. Find the voltage gain of the second stage,Q
   ₃−Q
   ₄.


5. Find the voltage gain of the output stage,Q
   ₅.


6. Find the overall voltage gain,v
   _out
   /v_id
   , wherev
   _out is the ac output voltage at node E, andv_id
    is the differential input between the bases ofQ
   ₁ andQ
   ₂.

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