On Line Quiz (3)

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(1) The common-source amplifier has a negative voltage gain. What does that mean? What is the source of this change in sign?

(2) Why do we need to know the input and output resistances of any amplifier?

(3) By definition, the output resistance of an amplifier is the equivalent resistance looking at the amplifier from the output terminals. Do we include Independent sources in the calculations? Explain.

(4) For proper use of the amplifier (linear operation), the input signal should be small. How small? Explain.

(5) When analyzing amplifier circuits on paper, we did the DC and AC analyses separately. Do we do that in the lab when we actually connect and make measurements? Explain.

(6) Give examples where the source-follower (CD amplifier) is useful.

(7) Which amplifier configuration (CS, CG, CD) is best suited for the following application. The input signal is a small AC current and an amplified current is required with high gain. Explain your answer.