Tuner circuit and receiving band change-over circuit with a push

Details Tuner circuit and receiving band change-over circuit with a push Tuner circuit and receiving band change-over circuit with a push

1989-08-07

1991-03-26

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455189, 455190, 455332, H04B 126

Patent

active

050036203

ABSTRACT:
Plural circuits for generating intermediate frequency signals such as UHF, VHF, HYPER intermediates frequency signals, etc. are provided in parallel. Each of the plural circuits includes an intermediate frequency amplifier, whose output impedance varies between high and low impedances dependent on whether or not the circuit operates. Thus, an intermediate frequency signal selected from the UHF, VHF, HYPER intermediate frequency signals is supplied from a circuit selected to be in operation from the plural circuits to an intermediate frequency signal output terminal.

REFERENCES:
patent: 4157505 (1979-06-01), Owens
patent: 4291290 (1981-09-01), Ijichi et al.
patent: 4418428 (1983-11-01), Evans
patent: 4495650 (1985-01-01), Konishi et al.
patent: 4736457 (1988-04-01), Kupfer

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