1) Design a BJT differential pair amplifier (balanced in, unbalanced out) that provides 20 dB differential gain and 40 dB CMRR. Assume β= 100, ro = 50 Kohm. Use dual dc power supplies +Vcc and -Vee.
2) ??????????????????A BJT differential amplifier is biased to have 500uA dc current in each device, β = 100, RC1 = RC2 = 1Kohm, and RE = 3Kohm. Assume ro = ∞. When operating in balanced in, balanced out mode what is the maximum allowable resistor tolerance (e.g.±N%) in order to have CMRR greater than or equal to 40 dB?
Hint: RC1 and RC2 may vary in opposite directions.