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SEMICONDUCTOR INTEGRATED CIRCUIT AND CIRCUIT OPERATION METHOD

  • US 20100056201A1
  • Filed: 08/19/2009
  • Published: 03/04/2010
  • Est. Priority Date: 08/29/2008
  • Status: Abandoned Application
First Claim
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1. A semiconductor integrated circuit comprising:

  • a reception-based analog front-end unit;

    a reception-based digital front-end unit; and

    a digital interface unit,wherein the reception-based analog front-end unit functions as a receiver for down-converting an RF reception signal into a reception-based analog base band signal, the RF reception signal being received at an antenna mounted on a communication terminal,wherein the reception-based digital front-end unit comprises an analog-to-digital converter and a reception-based digital filter unit,wherein the analog-to-digital converter converts the reception-based analog base band signal supplied from an output of the reception-based analog front-end unit into a reception-based digital base band signal,wherein the reception-based digital base band signal from the analog-to-digital converter is transmitted to the digital interface unit via the reception-based digital filter unit,wherein the digital interface unit is capable of supplying an external digital base band processing unit with the reception-based digital base band signal transmitted from the reception-based digital filter unit,wherein the reception-based analog front-end unit is capable of down-converting a first RF reception signal according to a first communication system and a second RF reception signal according to a second communication system received at the antenna into a first reception-based analog base band signal having a first signal band and a second reception-based analog base band signal having a second signal band narrower than the first signal band, respectively,wherein the analog-to-digital converter of the reception-based digital front-end unit comprises an oversampling analog-to-digital converter,wherein the oversampling analog-to-digital converter is capable of converting the first reception-based analog base band signal and the second reception-based analog base band signal supplied from the reception-based analog front-end unit into a first reception-based digital base band signal and a second reception-based digital base band signal, respectively,wherein the reception-based digital filter unit of the reception-based digital front-end unit comprises a first digital filter coupled to an output of the oversampling analog-to-digital converter,wherein the first digital filter is capable being used for a decimation process on the first reception-based digital base band signal supplied from the oversampling analog-to-digital converter and a decimation process on the second reception-based digital base band signal supplied from the oversampling analog-to-digital converter in common with each other,wherein the reception-based digital filter unit further comprises a second digital filter and a third digital filter parallel coupled between an output of the first digital filter and the digital interface unit,wherein the second digital filter down-samples the first reception-based digital base band signal, based on the first communication system, from the output of the first digital filter and thereby supplies the digital interface unit with the first reception-based digital base band signal having a first sampling rate, andwherein the third digital filter down-samples the second reception-based digital base band signal, based on the second communication system, from the output of the first digital filter and thereby supplies the digital interface unit with the second reception-based digital base band signal having a second sampling rate smaller than the first sampling rate.

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