SEMICONDUCTOR INTEGRATED CIRCUIT AND CIRCUIT OPERATION METHOD
First Claim
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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Abstract
There is a need for reducing a chip footprint of a multimode-compatible semiconductor integrated circuit. A reception-based analog front-end unit converts a first RF reception signal according to a first communication system and a second RF reception signal according to a second communication system into a first reception-based analog base band signal having a large signal band and a second reception-based analog base band signal having a small signal band, respectively. An oversampling analog-to-digital converter generates first and second reception-based digital base band signals. A first digital filter is used for a decimation process on the first and second reception-based digital base band signals in common with each other. Second digital filters perform a down-sampling process to generate the first reception-based digital base band signal having the large first sampling rate. Third digital filters perform a down-sampling process to generate the second reception-based digital base band signal having the small second sampling rate.
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Citations
20 Claims
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1. A semiconductor integrated circuit comprising:
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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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An operation method of 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 of 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, and wherein 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.
Specification