By Silvian Spiridon
This ebook introduces a brand new intuitive layout method for the optimum layout direction for next-generation software program outlined radio front-ends (SDRXs). The technique defined empowers designers to "attack" the multi-standard atmosphere in a parallel means instead of serially, offering a serious instrument for any layout method concentrating on 5G circuits and structures. during the publication the SDRX layout follows the main instant criteria of the instant (i.e., GSM, WCDMA, LTE, Bluetooth, WLAN), seeing that a receiver appropriate with those criteria is the main most likely candidate for the 1st layout new release in a 5G deployment. the writer explains the basic selection the fashion designer has to make concerning the optimum channel choice: how a lot of the blockers/interferers can be filtered within the analog area and what kind of will stay to be filtered within the electronic area. The system-level research the writer describes includes the direct sampling structure is handled as a selected case of mixer-based direct conversion structure. this enables readers provide an influence intake price range to figure out how a lot filtering is needed at the obtain course, via contemplating the ADC functionality features and the corresponding blocker diagram.
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Toward 5G Software Defined Radio Receiver Front-Ends
This ebook introduces a brand new intuitive layout technique for the optimum layout course for next-generation software program outlined radio front-ends (SDRXs). The technique defined empowers designers to "attack" the multi-standard setting in a parallel method instead of serially, supplying a serious instrument for any layout method concentrating on 5G circuits and platforms.
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Extra info for Toward 5G Software Defined Radio Receiver Front-Ends
Example text
If the communication is dual sideband, meaning both RF signals convey the same useful information, there is the no problem, since spectrum overlapping in the IF band is beneficial. However, this is not the case for the vast majority of applications, which are employing single side band communication. Thus, the unwanted image signal rejection becomes critical. SAW filter Ceramic filter RF IF LO IM LO RF Fig. 2 Overview of Receiver Architectures: Following the Image Rejection 15 Fig. 2 Downconversion: (a) without Image Rejection and (b) with Image Rejection The superheterodyne architecture solves the issue by filtering the image signal before it enters the mixer, or more precisely, immediately after the antenna.
However, this is not the case for the vast majority of applications, which are employing single side band communication. Thus, the unwanted image signal rejection becomes critical. SAW filter Ceramic filter RF IF LO IM LO RF Fig. 2 Overview of Receiver Architectures: Following the Image Rejection 15 Fig. 2 Downconversion: (a) without Image Rejection and (b) with Image Rejection The superheterodyne architecture solves the issue by filtering the image signal before it enters the mixer, or more precisely, immediately after the antenna.
The figure of merit quantizing the analog front-end’s second-order distortions is the second-order intercept point, IIP2. 4 depicts a generic situation for the effects of the second-order distortions on the receiver output. Basically, next to the very small useful RF signal, the receiver is exposed to a very large blocker. As the blocker presence or, respectively, moment of appearance is completely orthogonal to the RF signal broadcasting, due to second-order nonlinearity, the receiver output DC level will be larger or, respectively, change.
