Question 6.SP.6: Answer the following questions relating to a CE-connected tr......
Answer the following questions relating to a CE-connected transistor: (a) How are the input characteristics (i_B versus v_{BE}) affected if there is negligible feedback of v_{CE}? (b) What might be the effect of a too-small emitter-base junction bias? (c) Suppose the transistor has an infinite output impedance; how would that affect the output characteristics? (d) With reference to Fig. 3-9(b), does the current gain of the transistor increase or decrease as the mode of operation approaches saturation from the active region?
(a) The family of input characteristics degenerates to a single curve—one that is frequently used to approximate the family.
(b) If I_{BQ} were so small that operation occurred near the knee of an input characteristic curve, distortion would result.
(c) The slope of the output characteristic curves would be zero in the active region.
(d) Δi_C decreases for constant Δi_B; hence, the current gain decreases.