Mixer for frequency converting both ground and satellite broadca

Details Mixer for frequency converting both ground and satellite broadca Mixer for frequency converting both ground and satellite broadca

1990-12-13

1993-05-18

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551901, 455330, H04B 116

Patent

active

052128245

ABSTRACT:
A mixer for use in a double superheterodyne tuner which can receive either ground broadcasting channels or the satellite broadcasting channels is provided with frequency mixing diodes for the ground broadcasting signal and frequency mixing diodes for the satellite broadcasting signal. Switching diodes are provided between each of the frequency mixing diodes and output terminals of a balun transformer having an input terminal for receiving a local oscillation signal. When the ground broadcasting signal is received, the switching diodes connected to the frequency mixing diodes of the ground broadcasting are turned ON, with the switching diodes connected to the frequency mixing diodes of the satellite broadcasting are turned OFF, so that the leakage of the local oscillation signal to the satellite broadcasting signal when the ground broadcast signal is received is greatly reduced.

REFERENCES:
patent: 4002986 (1977-01-01), Ma
patent: 4271529 (1981-06-01), Strammello, Jr.
patent: 4485488 (1984-11-01), Houdart
patent: 4534062 (1985-08-01), Levinson
patent: 4633188 (1986-12-01), Matsuta
patent: 4637069 (1987-01-01), Charbonnier
patent: 4710974 (1987-12-01), Kupfer
patent: 4998293 (1991-03-01), Noboru
patent: 5006811 (1991-04-01), Kruger
patent: 5014349 (1991-05-01), Kubo et al.
"A Better Understanding Of Image Recovery Mixers", T. H. Oxley et al., (11th European Microwave Conference, 7-11 Sep. 1981, Amsterdam (NL), Sevenoaks (GB), pp. 197-202.

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