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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