## Abstract

Amplifiers and filters are commonplace devices in the *analog front-end* (AFE) of communication transmitters-receivers (transceivers, in short). In a general sense, these devices provide the necessary adaptation, in terms of power adjustment and signal isolation, between the transmission media (e.g., atmosphere, free space, cable, twisted-pair, optic fiber) and the digital signal processor (DSP) which performs most of the algorithmic tasks needed to guarantee a reliable transmission/reception of the information [1]. In some cases as, for instance, in wireless transceivers, amplification and filtering may take place at multiple steps along the AFE; often using different technologies (CMOS, silicon bipolar, GaAs) or external passive components (e.g., surface-acoustic wave filters) depending on the frequency range at which operations are realized [2]. In this chapter, following the main stream of the book, we focus on the realization of those amplifiers and filters which are used to drive signals to/from the AFE data converters^{†2} at the interface with the DSP block, paying special attention on their implementation in inexpensive CMOS technologies. Such amplifiers and filters are symbolically shown in Fig. 14.1, where preceding/following circuits for reception/transmission have been globally called Rx/Tx medium interface, respectively.

## Keywords

Noise Figure Power Gain Variable Gain Amplifier Compression Point Asymmetric Digital Subscriber Line## Preview

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