A novel RF front-end architecture for multi-band transceivers

Emerging wireless standards have pushed researchers to look for new RF architectures capable of operating at several frequency bands. Direct conversion between baseband and RF signals is gaining terrain towards becoming the RF front-end of choice. Six and five-port direct conversion receivers have demonstrated being an interesting technique since they can be designed and calibrated to operate in a wide frequency band. We present in this paper a new architecture for direct up-and-down conversion between baseband and RF signals. The main advantage of the proposal is its wideband operation due to a redundant vector basis.