Download Adaptive Multi-Standard RF Front-Ends (Analog Circuits and by Vojkan Vidojkovic, J. van der Tang, Arjan Leeuwenburgh, PDF

By Vojkan Vidojkovic, J. van der Tang, Arjan Leeuwenburgh, Arthur H.M. van Roermund

This booklet investigates strategies, merits, barriers, and prices linked to multi-standard operation of RF front-ends and their skill to evolve to variable radio environments. subsequent, it highlights the optimization of RF front-ends to permit greatest functionality inside of a undeniable strength funds, whereas concentrating on complete integration. ultimately, the e-book investigates probabilities for low-voltage, low-power circuit topologies in CMOS expertise.

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The filtering requirements can be relaxed if image rejection is performed after the frequency down-conversion. Two-path front-end architectures allow image rejection after the frequency down-conversion. 2. A SET OF FRONT-END ARCHITECTURES 39 Quadrature low-IF front-end architecture The most common two-path front-end architecture is the quadrature low-IF architecture [33]. It is presented in Fig. 21. The RFF and LNA have the same function as in the single-path architectures. The frequency down-conversion function is performed by a pair of mixers.

Considering the state of the art in ADCs currently it is not possible to design an ADC that can handle analog signals with such a large DR and at RF frequencies with a power consumption comparable to the power consumption of RF transceivers. For example, in [21] an 8-bit 2-Gsamples/s ADC in SiGe technology is presented. 5 W. 5 W is presented. These values are huge compared to a practical power consumption of a RF transceiver that is usually less then a few hundreds of milliwatts [23–25]. 20 CHAPTER 2.

A generic front-end architecture can be synthesized by connecting these building blocks in a specific order. 3). 1. A GENERIC FRONT-END ARCHITECTURE 19 today there is a clear tendency to implement as many receiver functions as possible in the digital domain. For example, in so-called digital RF systems, demodulation, equalization, de-interleaving and decoding are performed in the digital domain [1]. Hence, one of the basic front-end function is digitization. An Analog to Digital Converter (ADC) is the building block that performs this function.

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