Get Adaptive Multi-Standard RF Front-Ends (Analog Circuits and PDF

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

ISBN-10: 1402065337

ISBN-13: 9781402065330

This booklet investigates options, 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 a definite strength funds, whereas concentrating on complete integration. eventually, the ebook investigates chances for low-voltage, low-power circuit topologies in CMOS know-how.

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Additional resources for Adaptive Multi-Standard RF Front-Ends (Analog Circuits and Signal Processing)

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Com 38 CHAPTER 2. 20 Superheterodyne double-conversion front-end architecture possibility to implement tunability is very low. Therefore, flexibility of the IF sampling front-end architecture to accommodate requirements of different standards is low. Superheterodyne double-conversion front-end architecture The sampling frequency of the ADC, which can be relatively high in the superheterodyne front-end architecture, can be reduced applying the frequency down-conversion ones more. In this way, an superheterodyne double-conversion front-end architecture is obtained.

An Analog to Digital Converter (ADC) is the building block that performs this function. The most simple front-end in terms of minimal number of used building blocks is obtained by connecting an ADC to an antenna. Unfortunately, there are many implementation problems that prevent realization of this front-end. A major problem is a high power consumption of this ADC. There are two reasons for such a high power consumption. The first is a high frequency of the received analog signal. 4), the operating frequency is higher than 900 MHz.

The ideal filtering of the image signal is presented in Fig. 4. Xrf (ω ) and Xrff (ω ) are the amplitude spectra of the RF signal before and after the filtering, respectively. To suppress the component of the LO signal at positive or at negative frequency: Alo/@−ωlo = 0 or Alo/@ωlo = 0. Then the image signal can be rejected after the frequency down-conversion. The amplitude spectra of the LO signals with suppressed component at the positive or at negative frequency are presented in Fig. 5. Image rejection before frequency down-conversion Image rejection before the frequency down-conversion can be realized by filtering.

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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


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