Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2004-04-30
2008-11-11
Urban, Edward (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S126000
Reexamination Certificate
active
07450923
ABSTRACT:
According to one embodiment of the invention, a system for controlling carrier leakage in a communications device is provided. The system includes a first mixer unit operable to receive a first signal, to convert the first signal into a second signal having a higher frequency than the first signal, and to transmit the second signal. The system also includes a second mixer unit. The second mixer unit is operable to receive the second signal, to convert the second signal into an in-phase signal and a quadrature signal each having lower frequency than the second signal, and to transmit the in-phase signal and the quadrature signal. The system also includes a processor coupled to the first mixer and the second mixer. The processor is operable to perform a leakage reduction procedure by receiving the in-phase signal and the quadrature signal from the second mixer, sampling the in-phase signal and the quadrature signal, determining that a result from the sampling is not equal to a predetermined value, initiating a transmission of a direct current offset signal to the first mixer unit, and adjusting a voltage of the direct current offset signal until a next result of the sampling approximately equals the predetermined value.
REFERENCES:
patent: 7110469 (2006-09-01), Shi et al.
patent: 2004/0106380 (2004-06-01), Vassiliou et al.
Dantoni Francesco
Kumar Anil K V
Brady III W. James
Kempler William B.
Nguyen Tu X
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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