Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1992-12-23
1994-11-29
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455304, 455306, 455310, H04B 110
Patent
active
053697944
ABSTRACT:
The disclosure relates to the changing of frequencies. The mixing of a signal at a frequency Fe and of the signal of a local oscillator gives a resultant signal that comprises a first component at the useful frequency, a second component at the frequency of the oscillator and a third component which is an image of the first component with respect to the second one. A filtering highly attenuates the third component. A servo-control makes a part of the signal from the oscillator undergo variations in amplitude and phase before adding it to the resultant signal to be filtered; the variations are made so as to obtain a minimum energy from the second component before filtering. Application to the changing of frequencies with suppression of the component at the frequency of the local oscillator.
REFERENCES:
patent: 4355420 (1982-10-01), Ishihara
patent: 4373209 (1983-02-01), Kaneda
patent: 5033110 (1991-07-01), Harman
patent: 5086512 (1992-02-01), Bartz
patent: 5161254 (1992-11-01), Braathen
16th European Microwave Conference, Dublin, Sep. 8-12, 1986, pp. 157-163, W. Schiller, et al., "High Linearity Upconverter With Ultra Low Distortion Over A Broad Frequency . . . ".
Eisenzopf Reinhard J.
Thomson-LGT Laboratoire General des Telecommunications
Wisler Mark D.
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