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 adapted 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 adapted 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, adapted 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.
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Citations
30 Claims
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1. A multimode communication device comprising:
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at least one RF signal receiver adapted 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 adapted 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, adapted 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, 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;
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. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A multimode communication device comprising:
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a mixer adapted to convert an RF signal to an IF signal; and
a frequency source adapted to provide a mixing signal to the mixer, wherein;
when the RF signal corresponds to a first communication protocol, the mixing signal is characterized by a first mixing frequency; and
when the RF signal corresponds to a second communication protocol, the mixing signal is characterized by a second mixing frequency.
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Specification