In the previous chapter we assumed that the detector-preamplifier combination, which we shall now call the receiver, had a bandwidth of at least 0.5 times the bit-rate, or the baseband bandwidth for analogue signals, and low-noise. In this chapter we will consider the design and analysis of various preamplifier circuits, with the aim of optimising these characteristics. We shall consider the two most common types of preamplifier — the high input impedance design and the transimpedance design. In the noise analyses presented, we will only consider the performance of preamplifiers receiving digital signals.
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