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Combined front-end circuit for wireless transmission systems

  • US 7,142,884 B2
  • Filed: 10/25/2001
  • Issued: 11/28/2006
  • Est. Priority Date: 10/26/2000
  • Status: Active Grant
First Claim
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1. A front-end circuit for a multi-mode communication terminal device, comprising:

  • at least one switch element selected from the group consisting of RF switches, duplexers and diplexers;

    a common antenna;

    a first transmission system being a pure mode transmission system configured to operate in a pure TDD mode;

    a second transmission system being a pure mode transmission system configured to operate in a pure FDD mode;

    filters provided for said first and second transmission systems;

    a connecting circuit via which individual filters of said filters are connected to said common antenna, said connecting circuit comprising said at least one switch element;

    said filters comprising a first filter, a second filter, and a third filter, said first filter being a transmit filter of said FDD system, said second filter being a common receive filter for said TDD system and said FDD system, and said third filter being a transmit filter for said TDD system;

    a duplexer formed by said first filter and said second filter; and

    a switch element comprising an RE switch to connect said common antenna with one of said duplexer and said third filter.

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