Apparatus and associated method, for operating on receive signals received at a receiver
First Claim
1. In a multi-mode radio receiver operable to receive first receive signals generated during operation of a first radio communication system and to receive at least second communication signals generated during operation of at least a second radio communication system, the first radio communication system operable within a first frequency bandwidth and the second radio communication system operable within a second frequency bandwidth, an improvement of apparatus for operating upon signals generated during operation of the first radio communication system and signals generated during operation of at least the second communication system, said apparatus comprising:
- a converter coupled to receive indications of the first receive signals when received at the radio receiver and to receive indications of the at least the second receive signals when received at the radio receiver, said converter for converting the indications received thereat to a first-converted frequency range, selectively to form first-converted first receive signals of the first frequency bandwidth and selectively to form at least first-converted second receive signals of at least the second frequency bandwidth; and
a bandpass digitizer coupled to said converter to receive the first-converted first receive signals and the at least the first-converted second receive signals selectively formed by said converter, said bandpass digitizer for generating digitized signals in which noise component portions generated pursuant to digitizing of the first-converted first receive signal and the first-converted second receive signal, once digitized, are shifted in frequency.
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Accused Products
Abstract
Apparatus, and an associated method, for the IF stage of a receiver, such as the receive portion of a multi-mode mobile station. Direct conversion of an IF-stage receive signal is made into the digital domain through the use of a ΣΔ analog-to-digital converter. Increased portions of the receiver processes signals in the digital domain using digital-domain circuitry.
108 Citations
20 Claims
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1. In a multi-mode radio receiver operable to receive first receive signals generated during operation of a first radio communication system and to receive at least second communication signals generated during operation of at least a second radio communication system, the first radio communication system operable within a first frequency bandwidth and the second radio communication system operable within a second frequency bandwidth, an improvement of apparatus for operating upon signals generated during operation of the first radio communication system and signals generated during operation of at least the second communication system, said apparatus comprising:
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a converter coupled to receive indications of the first receive signals when received at the radio receiver and to receive indications of the at least the second receive signals when received at the radio receiver, said converter for converting the indications received thereat to a first-converted frequency range, selectively to form first-converted first receive signals of the first frequency bandwidth and selectively to form at least first-converted second receive signals of at least the second frequency bandwidth; and
a bandpass digitizer coupled to said converter to receive the first-converted first receive signals and the at least the first-converted second receive signals selectively formed by said converter, said bandpass digitizer for generating digitized signals in which noise component portions generated pursuant to digitizing of the first-converted first receive signal and the first-converted second receive signal, once digitized, are shifted in frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for operating upon signals received at a multi-mode radio receiver operable to receive first receive signals generated during operation of a first radio communication system and to receive at least second communication signals generated during operation of at least a second radio communication system, the first radio communication system operable within a first frequency bandwidth and the second radio communication system operable within a second frequency bandwidth, said method comprising:
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converting indications of the first receive signals, when received at the radio receiver, and indications of the at least the second receive signals, when received at the radio receiver, selectively into first-converted first receive signals of the first frequency bandwidth and selectively into at least first-converted second receive signals of at least the second frequency bandwidth; and
digitizing the first-converted first receive signals and the at least the first-converted second receive signals, formed during said operation of converting, at a bandpass digitizer, to form digitized signals in which noise component portions of the first-converted first receive signal and the first-converted second receive signal, once digitized, are shifted in frequency. - View Dependent Claims (17, 18, 19)
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20. Apparatus for operating upon receive signals received at a receive portion of a multi-mode cellular transceiver operable at least alternately to communicate by way of a first cellular communication system and at least a second cellular communication system, receive signals received at the cellular transceiver generated during operation of the first cellular communication system of a first frequency bandwidth and receive signals received at the cellular transceiver generated during operation of the at least the second cellular communication system of at least a second frequency bandwidth, said apparatus comprising:
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a converter coupled to receive indications of the receive signals received at the receive portion, said converter for forming intermediate-frequency analog representations of the receive signals;
a bandpass filter coupled to receive the intermediate-frequency analog representations formed by said converter, said bandpass filter exhibiting a bandpass at least as large as a largest of the first frequency bandwidth and the at least the second frequency bandwidth, said bandpass filter for passing intermediate-frequency filtered signals within the bandpass thereof; and
a bandpass digitizer coupled to said bandpass filter, said bandpass digitizer for digitizing the intermediate-frequency filtered signals passed by said bandpass filter, thereby to form digitized signals in which noise component portions generated pursuant to digitizing of the intermediate-frequency filtered signals, once digitized, are shifted in frequency.
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Specification