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.
Read or Download Adaptive Multi-Standard RF Front-Ends (Analog Circuits and Signal Processing) PDF
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Extra info for Adaptive Multi-Standard RF Front-Ends (Analog Circuits and Signal Processing)
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 . 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  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 . Hence, one of the basic front-end function is digitization. An Analog to Digital Converter (ADC) is the building block that performs this function.