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Three frequency receiver for mobile communication terminal

A technology of mobile communication terminals and receiving devices, which is applied in the direction of selection devices, electrical components, transmission systems, etc., and can solve the problems of increasing production processes and production costs

Inactive Publication Date: 2003-02-05
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In order to use a conventional dual-band mobile communication terminal under three frequency bands, the RF receiver must be replaced by a tri-band RF receiver containing each terminal for each frequency band, and a low-noise amplifier and filtering for the PCS must be additionally implemented device, thus increasing the production process and production cost

Method used

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  • Three frequency receiver for mobile communication terminal
  • Three frequency receiver for mobile communication terminal
  • Three frequency receiver for mobile communication terminal

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Embodiment Construction

[0025] Detailed Description of Preferred Embodiments

[0026] Embodiments of a mobile communication terminal tri-frequency receiving device according to the present invention will be described below with reference to the accompanying drawings.

[0027] image 3 is a block diagram showing a tri-band receiving apparatus for a mobile communication terminal according to the present invention.

[0028] Such as image 3 As shown, the tri-frequency receiving device enables the mobile communication terminal to operate in multiple frequency bands through the antenna, such as 900MHz EGSM (Extended Global System for Mobile Communications), 1800MHz DCS (Digital Cellular System) and 1900MHz PCS (Personal Communication System).

[0029] The three-frequency receiving device of the mobile communication terminal includes: a filter unit 100, which passes through each reception frequency corresponding to each frequency band in a signal received by an antenna (not shown); Impedance matching un...

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Abstract

A triple band receiving apparatus of a mobile communication terminal operated in three bands by installing an impedance matching unit and a band selection switching unit at the exterior of a dual band RF receiver, it includes a first SIMILAR a third filters for passing only signals corresponded to a first SIMILAR a third bands, an impedance matching unit for impedance-matching signals passing the second and the third filters and a RF (radio frequency) receiver for processing a signal inputted from the first filter and the switching unit as an intermediate frequency. Accordingly, by simplifying and miniaturizing a construction of an internal circuit, a mobile communication terminal can be efficiently miniaturized and light-weighed.

Description

technical field [0001] The present invention relates to a receiving device for a mobile communication terminal, in particular to a triple-frequency receiving device for a mobile communication terminal used in three frequency bands by adding a circuit to a dual-frequency mobile communication terminal. Background technique [0002] Currently, mobile communication terminals have been popularized in accordance with the trends of miniaturization, multi-function, diversity, and improved compatibility brought about by Internet devices, and thus the market for mobile communication terminals has rapidly expanded. In addition, in Europe, for dual-frequency mobile communication terminals used as GSM (Global System for Mobile Communications) and DCS (Digital Cellular System), tri-frequency mobile communication terminals for PCS (Personal Communication System) in addition to GSM and DCS, and available Interest in mobile communication terminals has increased around the world. [0003] GS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04B1/18H04B1/40
CPCH04B1/005H04B1/18H04B1/406
Inventor 金大铉
Owner LG ELECTRONICS INC