RF microelectronics
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
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Homodyne receivers are widely used in modern communication systems, as they can be integrated in a single integrated circuit. Despite their remarkable advantages, they are very sensitive to even order distortion. In this paper we present a circuit which aims at increasing the Second Order Intermodulation Interception Point (IIP2) of homodyne down-converter. The circuit is based on the use of three instead of two mixers for recovering the in-phase and quadrature components of bidimensional modulated signals. We present results obtained from simulations in a circuit designed on the 130 nm IBM RF technology. At the worst case, the improvement archived is higher than 20 dB.