Circuit arrangement for a tuner for changing over several freque

Details Circuit arrangement for a tuner for changing over several freque Circuit arrangement for a tuner for changing over several freque

1986-02-28

1987-12-01

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455330, H04B 126

Patent

active

047109742

ABSTRACT:
The disclosed invention relates to a circuit arrangement for a tuner, particularly a television tuner, for changing over several frequency ranges filtered out by bandpass filters, particularly the hyperband and UHF band, by means of diodes connected to a common IF circuit which also serve as mixer diodes for mixing signals passed by the bandpass filters with signals generated by associated RF oscillators. The desired frequency range is switched on by switching on the associated RF oscillator so that the otherwise cut-off diode of this frequency range becomes periodically conducting.

REFERENCES:
patent: 4363135 (1982-12-01), Moon
patent: 4419768 (1983-12-01), Yamashita et al.
patent: 4555809 (1985-11-01), Carlson
patent: 4573211 (1986-02-01), Kupfer
patent: 4590612 (1986-05-01), Ijichi
patent: 4596045 (1986-06-01), Maier

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