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Adaptive Multi-Standard RF Front-Ends (Analog Circuits and - download pdf or read online

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

ISBN-10: 1402065337

ISBN-13: 9781402065330

This ebook investigates ideas, advantages, 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 a definite strength funds, whereas focusing on complete integration. ultimately, the ebook investigates percentages for low-voltage, low-power circuit topologies in CMOS expertise.

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

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18). As explained, due to the convolution between the signals Xi (located at the frequency −ωi ) and Xlop , a part of the image signal (Xip ) is down-converted in the band of the wanted signal (Xwd ) (see Fig. 11). 32)), and assuming that Alop can not be reduced (due to the limited accuracy of I/Q generation), there are two possibilities to improve IRRmax . To suppress the component of the image signal that is down-converted in the band of wanted signal (Xip (ω )) (see Fig. 11 (c)). Most often, image rejection improvement in this way is performed in the digital domain.

This is a right place in a front-end to introduce amplification, while adding as less noise as possible. 1. 6)). A low NF is important because once a SNR is degraded, it is almost impossible to improve it later. If a high IRRmax is of interest, then complex filter should be used as a next building block in a front-end. It rejects positive or negative frequencies in the RF signal spectrum. After that, the signal frequency should be reduced applying frequency down-conversion. It is performed by a complex mixer.

Next, signals are converted to the analog domain using a Digital to Analog Converter (DAC). At the end, signals are up-converted to a high frequency and they are amplified by a power amplifier. RF circuit design is a delicate process involving many time-consuming steps. In industry, whole design teams work on one radio. Therefore, it is important to limit the scope. Actually, some of the most challenging and key RF blocks can be found in the receiver RF front-end. The block diagram of an RF front-end is presented in Fig.

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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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