ABSTRACT
This chapter discusses the details of what amplification is, what an amplifier is, and what are some of the figures of merit used to describe the process. It argues that knowledge to systems of multiple amplifiers in series, parallel, and with feedback loops. The chapter shows how an ensemble of many amplifiers with feedback could be used to describe a real-world type of system. It considers a more accurate representation of a real-world amplifier where an external source of power must be implemented in order to amplify the input signal. In the real world, however, amplifiers have a maximum value of signal amplification and, likewise, output. Johnson–Nyquist noise is typically found in a system when random signal outputs occur due to thermal agitation of components within it. The detector will be at a particular temperature and therefore will be generating thermal noise based on that parameter.
