Question: Assume Beta = 1 0 0 , VBE = 0 . 7 , ( VA = 7 8 V for Q 4 only ) 1

Assume Beta =100, VBE =0.7,(VA =78V for Q4 only)1. Find the bias voltages for Vb, Ve, Vc1, Vc2. Assume VDC on the input sources =0V 2. Find the current through all transistors. You can neglect early effect for all transistors except Q4.3. Draw the half circuits assuming a differential and common mode inputs. 4. Find the Differential mode gain Adm = Vout/Vid. Note Vout =(Vc2 Vc1). Assume DC is static and Vid has a small sinusoidal signal. 5. Find the Common mode gain Acm = Vout/VDC. Assume Vid =0 for this and VDC has a small sinusoidal signal.

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