A broadband receiver architecture for wireless communication systems

This paper describes a novel broadband receiver architecture for wireless communication systems. The mixing unit configuration is based on two 90° single balanced mixers, associated in anti-phase, to obtain wide-bandwidth differential IF signals. For single-ended analog front-end receivers, the terminals of each of the mixing units are connected, producing a single RF and LO signals. This is as opposed to polarimetric systems, where one LO and two RF signals are present. The broadband nature of the differential IF signals suggests that the proposed topology eliminates the need of either passive baluns, active baluns, or single to differential buffer amplifiers needed to produce 0° and 180° phase-shifted signals