Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Receiver
Reexamination Certificate
2007-05-15
2007-05-15
Pihulic, Dan (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Receiver
C342S203000
Reexamination Certificate
active
10830776
ABSTRACT:
A method for enlarging the interference-free dynamic range of non-linear signal-processing components in receiver systems, in the conversion of input frequencies fininto output frequencies fout. According to the invention, at least one linear combination of at least one input frequency fin,t, fin,band a fixed, predetermined oscillator fLOnof the components is calculated from the output signal of the component, for at least one output frequency fout,s, fout1,s, fouts,2, which combination is compared with any desired output frequency fout,tof the component, whereby the output frequency fout,s, fout1,s, fouts,2is then recognized as a spur and eliminated from the output signal of the component, if the calculated linear combination corresponds to any desired output frequency fout,tof the component, within a frequency and power range that can be predetermined.
REFERENCES:
patent: 2004/0263384 (2004-12-01), Gottscheber
patent: 1471651 (2004-10-01), None
“A Mathematical Model for the Evaluation of Spurious Response Interference in a Superheterodyne Receiver”, European Transactions on Telecommunications and Related Technologies May/Jun. 1990, No. 3, Milano, IT (pp. 265-276) by DeFranco, G.
“Application of Nomographs For Analysis and Prediction of Receiver Spurious Response EMI”, by Frederick W. Heather, Naval Air Test Center, Patuxent River, Maryland (pp. 390-398) New York, IEEE, Aug. 1985.
Collard & Roe P.C.
EADS Deutschland GmbH
Pihulic Dan
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