Highly improved IIP2 direct conversion receiver

  • Authors:
  • Antonio Felipe de Freitas Silva;Fernando Rangel de Sousa

  • Affiliations:
  • Federal University of Rio Grande do Norte, Natal-RN-Brazil;Federal University of Rio Grande do Norte, Natal-RN-Brazil

  • Venue:
  • Proceedings of the 22nd Annual Symposium on Integrated Circuits and System Design: Chip on the Dunes
  • Year:
  • 2009

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Abstract

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.