System and method providing variable-frequency IF conversion in a multimode communication device
First Claim
1. A multimode communication device comprising:
- at least one RF signal receiver operable to receive a first RF signal corresponding to a first communication protocol and a second RF signal corresponding to a second communication protocol in a time-multiplexed manner;
a frequency source operable to;
receive at least one frequency control signal; and
in response to the at least one frequency control signal, output a mixing signal at one of a plurality of selectable frequencies, wherein the plurality of selectable frequencies comprises a first mixing frequency corresponding to the first communication protocol and a second mixing frequency corresponding to the second communication protocol;
a mixer, communicatively coupled to the at least one RF signal receiver and the frequency source; and
at least one module, communicatively coupled to the frequency source, operable to;
direct the frequency source to output the mixing signal at a selected one of the plurality of selectable frequencies;
direct the frequency source to output the mixing signal at the first mixing frequency during time windows corresponding to the first communication protocol; and
direct the frequency source to output the mixing signal at the second mixing frequency during time windows corresponding to the second communication protocol.
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Accused Products
Abstract
A system and method providing variable-frequency IF conversion in a multimode communication device. Various aspects of the present invention provide a multimode communication device comprising at least one RF signal receiver adapted to receive at least a first RF signal corresponding to a first communication protocol and a second RF signal corresponding to a second communication protocol. A controllable frequency source may, for example, be adapted to output a mixing signal characterized by one of a plurality of selectable frequencies. Such selectable frequencies may, for example, comprise a first frequency corresponding to the first communication protocol and a second frequency corresponding to the second communication protocol. A mixer may, for example, receive a received RF signal from the RF signal receiver, receive a mixing signal from the controllable frequency source, and convert the received RF signal to an IF signal utilizing the received mixing signal.
16 Citations
86 Claims
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1. A multimode communication device comprising:
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at least one RF signal receiver operable to receive a first RF signal corresponding to a first communication protocol and a second RF signal corresponding to a second communication protocol in a time-multiplexed manner; a frequency source operable to; receive at least one frequency control signal; and in response to the at least one frequency control signal, output a mixing signal at one of a plurality of selectable frequencies, wherein the plurality of selectable frequencies comprises a first mixing frequency corresponding to the first communication protocol and a second mixing frequency corresponding to the second communication protocol; a mixer, communicatively coupled to the at least one RF signal receiver and the frequency source; and at least one module, communicatively coupled to the frequency source, operable to; direct the frequency source to output the mixing signal at a selected one of the plurality of selectable frequencies; direct the frequency source to output the mixing signal at the first mixing frequency during time windows corresponding to the first communication protocol; and direct the frequency source to output the mixing signal at the second mixing frequency during time windows corresponding to the second communication protocol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. In a multimode communication device, a method for receiving a plurality of RF signals corresponding to a plurality of respective communication protocols, the method comprising:
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receiving a first RF signal corresponding to a first communication protocol and a second RF signal corresponding to a second communication protocol in a time-multiplexed manner; directing a frequency source to generate a first mixing signal characterized by a first frequency corresponding to the first communication protocol during time windows corresponding to the first communication protocol; mixing the first RF signal and the first mixing signal at a mixer; directing the frequency source to generate a second mixing signal characterized by a second frequency corresponding to the second communication protocol during time windows corresponding to the second communication protocol; and mixing the second RF signal and the second mixing signal at the mixer. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A multimode communication device comprising:
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at least one RF signal receiver operable to receive a first RF signal corresponding to a first communication protocol and a second RF signal corresponding to a second communication protocol; a frequency source operable to; receive at least one frequency control signal; and in response to the at least one frequency control signal, output a mixing signal at one of a plurality of selectable frequencies, wherein the plurality of selectable frequencies comprises a first mixing frequency corresponding to the first communication protocol and a second mixing frequency corresponding to the second communication protocol; a mixer, communicatively coupled to the at least one RF signal receiver and the frequency source; a filter, communicatively coupled to the mixer, operable to filter a signal in accordance with a selected one of a plurality of selectable sets of filter characteristics, the plurality of sets of filter characteristics comprising; a first set of filter characteristics corresponding to the first communication protocol and comprising a first bandwidth; and a second set of filter characteristics corresponding to the second communication protocol and comprising a second bandwidth; and at least one module, communicatively coupled to the frequency source, operable to direct the frequency source to output the mixing signal at a selected one of the plurality of selectable frequencies, wherein; the at least one RF signal receiver is operable to receive the first RF signal and the second RF signal in a time-multiplexed manner; and the at least one module is operable to direct the frequency source to output the mixing signal at the first mixing frequency during time windows corresponding to the first communication protocol and at the second mixing frequency during time windows corresponding to the second communication protocol. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. In a multimode communication device, a method for receiving a plurality of RF signals corresponding to a plurality of respective communication protocols, the method comprising:
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receiving a first RF signal corresponding to a first communication protocol; directing a frequency source to generate a first mixing signal characterized by a first frequency corresponding to the first communication protocol; mixing the first RF signal and the first mixing signal at a mixer; receiving a second RF signal corresponding to a second communication protocol; directing the frequency source to generate a second mixing signal characterized by a second frequency corresponding to the second communication protocol; and mixing the second RF signal and the second mixing signal at the mixer; and filtering a mixed signal in accordance with a selected one of a plurality of selectable sets of filter characteristics, the plurality of sets of filter characteristics comprising; a first set of filter characteristics corresponding to the first communication protocol and comprising a first bandwidth; and a second set of filter characteristics corresponding to the second communication protocol and comprising a second bandwidth, wherein; receiving the first RF signal and receiving the second RF signal are performed in a time-multiplexed manner; directing the frequency source to generate the first mixing signal characterized by the first frequency corresponding to the first communication protocol comprises directing the frequency source to generate the first mixing signal during time windows corresponding to the first communication protocol; and directing the frequency source to generate the second mixing signal characterized by the second frequency corresponding to the second communication protocol comprises directing the frequency source to generate the second mixing signal during time windows corresponding to the second communication protocol. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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59. A multimode communication device comprising:
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at least one RF signal receiver operable to receive a first RF signal corresponding to a first communication protocol and a second RF signal corresponding to a second communication protocol; a frequency source operable to; receive at least one frequency control signal; and in response to the at least one frequency control signal, output a mixing signal at one of a plurality of selectable frequencies, wherein the plurality of selectable frequencies comprises a first mixing frequency corresponding to the first communication protocol and a second mixing frequency corresponding to the second communication protocol; a mixer, communicatively coupled to the at least one RF signal receiver and the frequency source; a filter, communicatively coupled to the mixer, operable to filter a signal in accordance with a selected one of a plurality of selectable sets of filter characteristics, the plurality of sets of filter characteristics comprising; a first set of filter characteristics corresponding to the first communication protocol and comprising a first center frequency; and a second set of filter characteristics corresponding to the second communication protocol and comprising a second center frequency; and at least one module, communicatively coupled to the frequency source, operable to direct the frequency source to output the mixing signal at a selected one of the plurality of selectable frequencies, wherein; the at least one RF signal receiver is operable to receive the first RF signal and the second RF signal in a time-multiplexed manner; and the at least one module is operable to direct the frequency source to output the mixing signal at the first mixing frequency during time windows corresponding to the first communication protocol and at the second mixing frequency during time windows corresponding to the second communication protocol. - View Dependent Claims (60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72)
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73. In a multimode communication device, a method for receiving a plurality of RF signals corresponding to a plurality of respective communication protocols, the method comprising:
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receiving a first RF signal corresponding to a first communication protocol; directing a frequency source to generate a first mixing signal characterized by a first frequency corresponding to the first communication protocol; mixing the first RF signal and the first mixing signal at a mixer; receiving a second RF signal corresponding to a second communication protocol; directing the frequency source to generate a second mixing signal characterized by a second frequency corresponding to the second communication protocol; and mixing the second RF signal and the second mixing signal at the mixer; and filtering a mixed signal in accordance with a selected one of a plurality of selectable sets of filter characteristics, the plurality of sets of filter characteristics comprising; a first set of filter characteristics corresponding to the first communication protocol and comprising a first center frequency; and a second set of filter characteristics corresponding to the second communication protocol and comprising a second center frequency, wherein; receiving the first RF signal and receiving the second RF signal are performed in a time-multiplexed manner; directing the frequency source to generate the first mixing signal characterized by the first frequency corresponding to the first communication protocol comprises directing the frequency source to generate the first mixing signal during time windows corresponding to the first communication protocol; and directing the frequency source to generate the second mixing signal characterized by the second frequency corresponding to the second communication protocol comprises directing the frequency source to generate the second mixing signal during time windows corresponding to the second communication protocol. - View Dependent Claims (74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86)
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Specification