This chapter describes the operation of small-signal amplifiers using bipolar transistors and FETs, together with the operation of large-signal amplifiers using bipolar transistors and thermionic valves. The FET is not suitable for high-power amplification, but is satisfactory as a low-gain low-power amplifier with very high input impedance. Amplification at high frequencies is also described where all three types of amplifying device are used, each being suited to certain applications. The amplifiers so far described, in this book and in Electronics II have been single-stage, using just one transistor or valve; this chapter outlines the performance of two-stage transistor amplifiers, together with their methods of interstage coupling.
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