System and method providing variable-frequency if conversion in a multimode communication device
First Claim
Patent Images
1. A multimode communication device comprising:
- at least one RF signal receiver operable to receive a first RF signal during at least one time window corresponding to a first communication protocol and a second RF signal during at least one time window 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, where the plurality of selectable frequencies comprises;
a first mixing frequency corresponding to the first communication protocol, where the first mixing frequency is an RF frequency utilized for direct conversion of the first RF signal to a baseband frequency and is output during the at least one time window corresponding to the first communication protocol; and
a second mixing frequency corresponding to the second communication protocol, where the second mixing frequency is an IF frequency utilized for conversion of the second RF signal to an intermediate frequency and is output during the at least one time window 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.
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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.
32 Citations
20 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 during at least one time window corresponding to a first communication protocol and a second RF signal during at least one time window 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, where the plurality of selectable frequencies comprises; a first mixing frequency corresponding to the first communication protocol, where the first mixing frequency is an RF frequency utilized for direct conversion of the first RF signal to a baseband frequency and is output during the at least one time window corresponding to the first communication protocol; and a second mixing frequency corresponding to the second communication protocol, where the second mixing frequency is an IF frequency utilized for conversion of the second RF signal to an intermediate frequency and is output during the at least one time window 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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 during at least one time window corresponding to a first communication protocol; directing a frequency source to generate, during the at least one time window corresponding to the first communication protocol, a first mixing signal characterized by a first frequency corresponding to the first communication protocol, where the first mixing frequency is an RF frequency utilized for direct conversion of the first RF signal to a baseband frequency; mixing the first RF signal and the first mixing signal at a mixer; receiving a second RF signal during at least one time window corresponding to a second communication protocol; directing the frequency source to generate, during the at least one time window corresponding to the second communication protocol, a second mixing signal characterized by a second frequency corresponding to the second communication protocol, where the second mixing frequency is an IF frequency utilized for conversion of the second RF signal to an intermediate frequency; and mixing the second RF signal and the second mixing signal at the mixer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification
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Current AssigneeAvago Technologies International Sales Pte Limited (Broadcom, Inc.)
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Original AssigneeBroadcom Corporation (Broadcom, Inc.)
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InventorsBehzad, Arya, Rofougaran, Ahmadreza
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Primary Examiner(s)Nguyen, Lee
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Application NumberUS13/052,572Publication NumberTime in Patent Office414 DaysField of Search455/76, 455 85- 86, 455/260, 455/552.1, 455/553.1, 370336-337, 370/347US Class Current455/76CPC Class CodesH04B 1/28 the receiver comprising at ...H04B 1/406 with more than one transmis...H04L 27/0002 analog front ends; means fo...
