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Direct Baseband I-Q Regeneration Method for Five-Port Receivers Improving DC-Offset and Second-Order Intermodulation Distortion Rejection

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5 Author(s)
Cristina de la Morena-Alvarez-Palencia ; Grupo de Microondas y Radar, Departamento de Señales, Sistemas y Radiocomunicaciones, Universidad Politécnica de Madrid, Madrid, Spain ; Kaïs Mabrouk ; Bernard Huyart ; Amadou Mbaye
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Six-/five-port architecture has advantages compared with conventional receiver architectures, especially for high frequencies and high-data-rate applications. However, it requires two/one additional baseband outputs and a calibration process to recover the original signal. While this problem is resolved in conventional six-port configurations, a solution is needed for five-port architectures. We propose an I/Q regeneration method based on the use of a simple analog circuit, eliminating one baseband output. The structure of this circuit derives from a mathematical formulation, which is presented in this paper. The validity of the method has been experimentally proved in a five-port receiver prototype. In addition, its capacity to reduce the dc-offset and second-order intermodulation distortion has been demonstrated.

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IEEE Transactions on Microwave Theory and Techniques  (Volume:60 ,  Issue: 8 )