Multiple-mode direct conversion receiver
DC CAFC
First Claim
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1. A multiple-band communication receiver, comprising:
- receiving means for receiving communication signals in any one of a plurality of frequency bands, the received communication signals having a bandwidth;
amplifier means for selectively amplifying the received communication signals in one of the plurality of frequency bands, wherein the amplifier means includes at least one band-specific amplifier for each of the plurality of frequency bands;
quadrature generation means for generating in-phase and quadrature signals from the amplified signals;
low pass filtering means for filtering the in-phase and quadrature signals; and
baseband processing means for processing the filtered in-phase and quadrature signals,wherein the multiple-band communication receiver uses direct conversion for converting all of the received communication signals in any one of the plurality of frequency bands.
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Abstract
A multiple-mode receiver incorporating direct conversion (processing received signals using intermediate frequencies within the same frequency range as the received signal bandwidth) rather than superheterodyne circuitry, allowing receiver hardware components to be re-used rather than replicated for each band. Various embodiments are disclosed in which low pass filters, mixers, quadrature generators, oscillators, and amplifiers are re-used.
126 Citations
18 Claims
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1. A multiple-band communication receiver, comprising:
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receiving means for receiving communication signals in any one of a plurality of frequency bands, the received communication signals having a bandwidth; amplifier means for selectively amplifying the received communication signals in one of the plurality of frequency bands, wherein the amplifier means includes at least one band-specific amplifier for each of the plurality of frequency bands; quadrature generation means for generating in-phase and quadrature signals from the amplified signals; low pass filtering means for filtering the in-phase and quadrature signals; and baseband processing means for processing the filtered in-phase and quadrature signals, wherein the multiple-band communication receiver uses direct conversion for converting all of the received communication signals in any one of the plurality of frequency bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for receiving a communication signal, comprising the steps of:
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receiving a communication signal in any one of a plurality of frequency bands, the communication signal having a bandwidth; band-pass filtering the received communication signal; amplifying the band-pass filtered signal; mixing the band-pass filtered signal with in-phase and quadrature oscillator signals to generate an in-phase and a quadrature received signal; and low pass filtering the in-phase received signal and the quadrature received signal in a low pass in-phase filter and a low pass quadrature filter, respectively, wherein direct conversion is used for converting all received communication signals in any one of the plurality of frequency bands. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification
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Litigation Data
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Current AssigneeTelefonaktiebolaget LM Ericsson
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Original AssigneeTelefonaktiebolaget LM Ericsson
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InventorsKunkel, Lars-Peter, Mannerstr.ang.le, Jacob, Gustafsson, Kjell, Lindquist, Bjorn, Celander, Jan, Carlsson, Torsten, Isberg, Martin, Jakobsson, Peter
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Primary Examiner(s)Chin, Wellington
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Assistant Examiner(s)Ferguson, Keith
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Application NumberUS08/886,244Time in Patent Office966 DaysField of Search455/323, 455/313, 455/311, 455/339, 455/131, 455/150.1, 455/280, 455/180.1, 455/188.1, 455/189.1, 455/190.1, 455/191.1, 455/255, 455/256, 455/258, 455/101 , 455/86, 375/316, 375/324, 375/350, 375/334US Class Current455/131CPC Class CodesH03J 5/244 using electronic meansH04B 1/005 adapting radio receivers, t...H04B 1/0057 using diplexing or multiple...H04B 1/006 using switches for selectin...H04B 1/406 with more than one transmis...H04W 88/06 adapted for operation in mu...
