Download Adaptive Multi-Standard RF Front-Ends (Analog Circuits and by Vojkan Vidojkovic, J. van der Tang, Arjan Leeuwenburgh, PDF
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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Additional resources for Adaptive Multi-Standard RF Front-Ends (Analog Circuits and Signal Processing)
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◦ .