RF Circuit Design, 2nd Edition

CHAPTER 5 The Transistor at Radio Frequencies

In Chapter 1, we discussed resistors, capacitors, and inductors, and their behavior at radio frequencies. We found that, when working at higher frequencies, we could no longer think of a capacitor as just a capacitor, or an inductor as a perfect inductor. In fact, each of these components can be represented by an equivalent circuit that indicates just how imperfect that component really is.

In this chapter, we will find that the transistor, too, is an imperfect device whose characteristics also vary with frequency. Therefore, the equivalent circuit for a typical transistor is introduced and analyzed. Then, with the aid of the equivalent circuit, the input, output, feedback, and gain characteristics ...