Combined front-end circuit for wireless transmission systems
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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Abstract
A front-end circuit is provided for a communication terminal device that is designed for a multi-band and/or multi-mode operation. Various embodiments are provided that are suitable for mobile radiotelephone devices of the third generation and, in particular, for transmission systems according to the UMTS standard upon involvement of a multi-band GSM system.
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Citations
15 Claims
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1. A front-end circuit for a multi-mode communication terminal device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification