By Vojkan Vidojkovic, J. van der Tang, Arjan Leeuwenburgh, Arthur H.M. van Roermund
This booklet investigates strategies, merits, obstacles, and prices linked to multi-standard operation of RF front-ends and their skill to conform to variable radio environments. subsequent, it highlights the optimization of RF front-ends to permit greatest functionality inside a undeniable energy funds, whereas concentrating on complete integration. ultimately, the booklet investigates probabilities for low-voltage, low-power circuit topologies in CMOS know-how.
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This booklet investigates recommendations, advantages, obstacles, 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 a definite strength funds, whereas concentrating on complete integration.
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Additional info for Adaptive Multi-Standard RF Front-Ends (Analog Circuits and Signal Processing)
If interfering signals are enough suppressed and the wanted signal is weak, then the amplification function has to be done first. There is also possibility to use one building block that can provide filtering and amplification function at the same time. g. information is stored in the amplitude), then the amplification should be variable in order to map the wanted signal in the ADC dynamic range. Since a complex signal is converted into the digital domain by using two ADCs, additional image rejection improvement can be done in the digital domain.
The set of four mixers in Fig. 14 can be considered as one building block. It is called a complex mixer. A set of two mixers and a single mixer represent special cases of a complex mixer. Based on that, the properties of frequency downconversion function are updated. 3. It is important to notice that the application of complex filtering before frequency down-conversion (as presented in Fig. 14) results in generation of RF I/Q signals (see Fig. 8). 32 CHAPTER 2. 4. Since the set of front-end building blocks is available, the last issue that has to be considered before synthesis of a generic front-end architecture is their order.
In Fig. 13 the filtering of the negative side of the amplitude spectrum Xrf (ω ) is presented. Comparing Figs. 11(c), it is clear that they are very similar. Based on that, the action of suppressing the signal Xi/@−ωi (ω ) can be realized by applying complex filtering. Hence, in order to improve IRRmax it is necessary to apply complex filtering on the signal xrf (t) and then to apply the frequency down-conversion function. The system that can perform frequency down-conversion function with an improved IRRmax is depicted in Fig.
Adaptive Multi-Standard RF Front-Ends (Analog Circuits and Signal Processing) by Vojkan Vidojkovic, J. van der Tang, Arjan Leeuwenburgh, Arthur H.M. van Roermund