Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2006-10-03
2006-10-03
Eng, George (Department: 2617)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S316000, C375S322000
Reexamination Certificate
active
07116963
ABSTRACT:
A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the channel spacing or one-half of a channel spacing displaced from an integer multiple of the channel spacing. The local oscillator signal is selected to frequency translate the signal of interest to within a near-baseband passband whose lower edge is spaced from DC by at least about the maximum bandwidth of the signal of interest. Problems associated with 1/f noise, DC offsets, and self-mixing products are avoided or substantially diminished. Other methods and systems are also disclosed.
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Bhattacharya Sam
Eng George
Suominen Edward A.
University of Washington
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