Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2006-10-03
2006-10-03
Anderson, Matthew D. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S324000, C455S552100, C455S553100, C455S550100
Reexamination Certificate
active
07116965
ABSTRACT:
A radio receiver configurable to operate in either a low-IF or a zero-IF mode comprises a quadrature down-converter (108,110,112,114) for generating in-phase (I) and quadrature (Q) signals at an intermediate frequency and a complex filter (202) for performing image rejection filtering. One of the outputs (Q) of the filter (202) is terminated, the other (I) is passed to a non-complex ADC (206). The output from the ADC is processed digitally then a quadrature signal generator (212,214) generates quadrature-related IF signals which are passed to a down-converter (216,218) for conversion to baseband signals. By enabling analogue-to-digital conversion and channel filtering to be performed at IF on non-complex signals, significant power savings are possible. Further, the flexibility of the receiver is enhanced, enabling it to operate efficiently in both low-IF and zero-IF modes.
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By M. J. Gingell, Entitled “Single Sideband Modulation Using Sequence Asymmetric Polyphase Networks”, Electronic Communications, vol. 48M Nov. 1 and 2, 1973. pp. 21-25.
Minnis Brian J.
Moore Paul A.
Anderson Matthew D.
Im Paul
Koninklijke Philips Electronics , N.V.
Pham Tuan
Waxler Aaron
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