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QuickNote
(A Five Minute Tutorial)

1. Main Concepts To Learn: how the small-signal hybrid-pi model represents the transistor parameter variation(DV_CE, DI_C...).
   Representation of the equivalent-circuit under small-signal hybrid-pi model.
   The roles of each capacitance and resistor: what are they associated to in  the physical view.
   The connection between the physical device and the equivalent circuit.

    2. A Quick Step-By-Step For Each Topic:

• Topic-1: The small-signal hybrid-p model provides a relationship among the V_CE and I_b, I_c. See "Mathematical Analysis" for the math illustration.
• Topic-2: The circuit diagram shows the representation of small-signal hybrid-pi model for common-emitter use.
• Topic-3: C_p: the sum of emitter-base depletion-layer capacitance and emitter-base diffusion capacitance;
  C_m: the depletion-layer capacitances of collector-base diodes;
  r_p: the input resistance relates V_be to I_b;
  r₀: the output resistance relates V_ce to I_c;
  r_e, r_b, r_c: parasitic resistances for emitter, base and collector, respectively.
• Topic-4: The relationship is shown in the auto demo of the applet.