Response to the following problem:
In a particular BJT differential amplifier, a production error results in one of the transistors having an emitter- base junction area that is twice that of the other. With the inputs grounded, how will the emitter bias current split between the two transistors? If the output resistance of the current source is 500 kΩ and the resistance in each collector (RC) is 12 kΩ, find the common-mode gain obtained when the output is taken differentially. Assume α ? 1.
[Hint: The CM signal current vicm/REE will split between Q1:and Q2:in the same ratio as the bias current I does.]