![]() They struggled in close games, going 2–8 when the margin was seven points or fewer during Henning's reign, they were a cumulative 6–22 in such games. San Diego's poor record contrasted with a roughly average statistical season. The team failed to improve on their 6–10 record in 1990, losing eight of their first nine games and finishing at 4-12, their fourth consecutive losing season. The 1991 San Diego Chargers season was the franchise's 22nd season in the National Football League (NFL), the 32nd overall and the third and final season under head coach Dan Henning. ![]() In subsequent chapters, these boundary conditions will be translated into the design of various sub component specifications.In 1991, general manager Bobby Beathard used a mix of free agency, trades and the draft to bring in several key members of the squad who contested Super Bowl XXIX three years later. Examples of these sub blocks include low-noise amplifiers (LNA), mixers, and intermediate frequency (IF) amplifiers. Next we translate these boundary conditions into boundary conditions of the front end sub blocks. We then adopt specific receiver architecture and translate the boundary conditions imposed by the channel and the demodulator on the front end (specified in Chapter 1 in terms of communication concepts ) to circuit concepts (gain, noise figure, distortion). We first review some general philosophy on deciding the front end architecture. Specifically, in this chapter we discuss the architecture of the front end as well as the filters inside, and in the rest of the book we concentrate on the design of active components inside the front end. In this chapter and the rest of the book, we emphasize this front end part of the communication system. ![]() ![]() We now redraw Figure 1.1 as Figure 2.1, with the receiver front end enclosed by dotted lines. They are the modulator, demodulator, and channel part of the communication system. In Chapter 1 we focused on the blocks enclosed by dotted lines in Figure 1.1. ![]()
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