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

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

This e-book investigates options, merits, boundaries, 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 definite strength funds, whereas focusing on complete integration. eventually, the e-book investigates percentages for low-voltage, low-power circuit topologies in CMOS expertise.

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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 second is the large dynamic range of the received signal. In order to have an estimate for a required dynamic range that has to be handled by the ADC, the DECT system is taken as an example. The DECT standard specifies front-end sensitivity of Psens = −86 dBm [31] (see appendix A). Taking into account a margin of 4 dB, a receiver sensitivity of −90 dBm is set as a target.

564 66 5 −13 50 87 3 frequency distance between the wanted signal and interferer. 45)). 5. IRRcf is the required image rejection assuming that the suppressed image signal is 20 dB lower than the wanted signal. In this case a SNR deterioration is negligible. An IFCF with these orders and operating frequencies can be integrated [25, 41]. Since IFCF in the quadrature low-IF front-end architecture can be integrated, a high level of integration can be achieved and rather expensive discrete band-pass filters are avoided.

24 CHAPTER 2. 5 Amplitude spectra of the LO signal when the component at the pos- itive frequency (ωlo ) is suppressed (a) and when the component at the negative frequency (−ωlo ) is suppressed (b) To reject the image signal before the frequency down-conversion: Ai = 0. 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.

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