Reconfigurable amplifier towards enhanced selectivity of future multi-band mobile terminals

A single-path configuration and use of single-band devices with distributed reconfigurable matching networks have the potential to achieve the optimum RF front-end for future multi-band mobile terminals. Considering the difficulties in configuring a practical tunable filter as a top filter, collaboration between the filter and low-noise amplifier (LNA) is a candidate to achieve the performance level required for the RF front-end. More precisely, the LNA should have high selectivity against undesired out-of-band signals, and the selectivity should be tunable. As the first step, this paper presents a reconfigurable amplifier that incorporates integrated matching networks with MEMS switches. The fabricated amplifier that can change the frequency response exhibits an advantage through measurement with an out-of-band signal.