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Architecture of a reconfigurable radio receiver front-end using overall feedback

In contemporary radio receivers for mobile applications, the front-end is an inflexible device. Its performance cannot be changed. The modern radio environment, however, is highly variable, due to changing quality of the radio channel and the varying demands that users (applications) pose on communication speed and quality. The result is that a receiver designed to perform under the worst-case conditions provides performance overkill most of the time at the expense of excessive power consumption. In near-future handsets (or headsets) for mobile multimedia applications, this may become a severe problem as front-end power consumption is significant in current mobile devices already. In this paper a solution is proposed in the form of a radio front-end which changes itself to the form which fits the actual reception situation best. It has a reconfigurable architecture and adaptive circuits. In one architecture, it employs overall feedback to achieve a high dynamic range. In another architecture, the dynamic range is smaller at a lower power consumption. The design aims to work at a carrier frequency of 433MHz, to show the concept’s feasibility and allow for relatively simple hardware testing. The main aspects of the system design are discussed, showing its feasibility.