Exercise 4.4 An NPN amplifier and its PNP equivalent

Given are the amplifier circuit schematics below.

a)

Derive a SSEC for the amplifier circuit in figure (a).

b)

Derive a (parametric) equation for the input impedance $r_{\mathit{in}}$ of the amplifier circuit in figure (a). You may assume that the coupling capacitors have a negligibly small impedance at the signal frequency.

c)

Derive a equation for the voltage gain of the amplifier circuit in figure (a).

d)

Derive a SSEC for the amplifier circuit in figure (b).

e)

Derive an equation for the input impedance $r_{\mathit{in}}$ of the amplifier circuit in figure (b).

f)

Derive a equation for the voltage gain of the amplifier circuit in figure (b).