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

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

This ebook investigates ideas, advantages, 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 of a definite strength funds, whereas focusing on complete integration. eventually, the e-book investigates chances for low-voltage, low-power circuit topologies in CMOS know-how.

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The amplitude spectrum of the down-converted signal is denoted with Xif (ω ) and it is presented in Fig. 3(c). 18) Xwd+ (ω ) and Xwd− (ω ) are the spectra of the down-converted wanted signal located at positive and negative frequencies, respectively. The same is valid for the spectra Xid+ (ω ) and Xid− (ω ) of the down-converted image signal. 1. 13) are fulfilled, it is clear that the amplitude spectrum of the down-converted image signal (Xid (ω )) is on top of the amplitude spectrum of the down-converted wanted signal (Xwd (ω )).

11(b), it is clear that IRRmax is limited by the accuracy of I/Q generation. Also, due to the fact that the complex filter provides a finite attenuation in the stop band, a part of the down-converted image signal, which is denoted with Xidf , remains un-rejected (see Fig. 11(d)). This signal deteriorates IRRmax . Therefore, the total image rejection ratio (IRRtot ), which takes into account finite attenuation of the complex filter, is always lower than IRRmax . Complex filter The block diagram of a complex filter is given in Fig.

Such signals are called quadrature signals and consequently, LO is called Quadrature LO (QLO). These are also called I/Q signals, where I denotes an in-phase component and Q denotes a quadrature component. Based on these considerations it is possible to synthesize the down-converter that can perform the frequency down-conversion function and that can allow image rejection after the frequency down-conversion. This system is presented in Fig. 9. An ideal QLO generates I and Q signals, which have exactly the same amplitude and the phase difference of 90◦ .

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