4 Small signal equivalent circuits

Exercise 4.1 Signal sources, loads and overall gain
Exercise 4.2 An NMOS amplifier circuit
Exercise 4.3 Rubbish from internet - find an error
Exercise 4.4 An NPN amplifier and its PNP equivalent
Exercise 4.5 AN NMOS amplifier circuit
Exercise 4.6 An amplfier with a single NPN
Exercise 4.7 An NPN amplifier and bandwidth issues
Exercise 4.8 An NMOS amplifier with weird biasing
Exercise 4.9 A degenerated NMOS amplifier
Exercise 4.10 Basic amplifiers with an NPN and an NMOS transistor
Exercise 4.11 A triode vacuum tube
Exercise 4.12 A pentode vacuum tube
Exercise 4.13 A PNP