RF Component Approaches and Architectures Challenged as Mobile Moves to Next-Generation Networks
Until the deployment of early LTE networks, the design of the RF system was fairly simple and straightforward, involving a relatively small number of front-end components. However, the design of the RFFE has since become increasingly more complex with the upgrade to LTE-Advanced. These latest technologies have enabled 4G networks to become efficient and reliable through the use of carrier-aggregation (CA), MIMO, diversity, and envelope tracking.
In addition, the need to support a multitude of LTE bands in myriad combinations across the globe has amplified RF design complexity, leading to the addition of a greater number of RF components needed to support these bands and permutations. In the very constrained environment of smartphones, in terms of both energy and overall form factor, the RFFE system needs to be meticulously designed in order to optimize the overall performance of the device and mitigate interferences. T…!-->![endif]-->!--[if>!-->
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