Circuit configuration for range changing in tuners

Details Circuit configuration for range changing in tuners Circuit configuration for range changing in tuners

1991-05-20

1993-05-25

Gensler, Paul

Tuners

Combined diverse-type tuners

334 15, 334 47, 4551882, 4551901, H03J 524

Patent

active

052143996

ABSTRACT:
A circuit configuration, especially in a television set, for range switching in tuners having at least two ranges includes at least two preselector stages each being assigned a respective tuner range. Each of the preselector stages is connected between a supply potential terminal and a reference potential terminal. Each of the preselector stages has an input terminal, an output terminal and an MOS tetrode. A switchgear for activating each of the MOS tetrodes has a switch output terminal being connected to the preselector stages and being connectable to the reference potential terminal. The preselector stages are coupled to one another for activating one of the preselector stages as a function of a switch state of the switch output terminal.

REFERENCES:
patent: 4442548 (1984-04-01), Lehmann
patent: 4590612 (1986-05-01), Ijichi
patent: 4823099 (1989-04-01), Leipert
patent: 4851796 (1989-07-01), Hendriks
"ICs fur die Unterhaltungselektronik" 1986, Siemens Datenbuch: pp. 767-768.

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