Answer: Transient response via stored charge in base (Q B = I C × tau_F).
- A Mainly the static DC bias point, with little transient information
- B Transient response via stored charge in base (Q<sub>B</sub> = I<sub>C</sub> × tau_F)
- C Mainly the large-signal switching behavior, ignoring small-signal response
- D Random thermal and shot noise generated within the transistor
Correct answer: B. Transient response via stored charge in base (Q<sub>B</sub> = I<sub>C</sub> × tau_F)
Explanation: Charge control model: I<sub>C</sub> = Q<sub>B</sub>/tau_F where Q<sub>B</sub> is minority charge stored in base and tau_F is forward transit time. Foundation of BJT switching analysis.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.