Frequency synthesizing type electronic tuner

Details Frequency synthesizing type electronic tuner Frequency synthesizing type electronic tuner

1983-10-13

1985-07-02

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

331 49, H04B 126, H03L 718

Patent

active

045272808

ABSTRACT:
In a frequency synthesizer type electronic tuner comprising a plurality of local oscillators operable in frequency ranges different from each other, only one of said local oscillators being operable in accordance with a received frequency band, and the outputs of the local oscillators being connected with a prescaler constituting a PLL station selecting circuit through a coupling circuit which includes series connected circuits of resistors and capacitors, respectively, characterized in that the resistors in said coupling circuit are connected on the side thereof adjacent to the local oscillators, while the capacitors in the coupling circuit are connected on the side thereof adjacent to the prescaler, so that resistors and capacitors are used in a connecting part between the local oscillator circuit and the prescaler of the tuner thereby the separation between VHF and UHF bands is improved.

REFERENCES:
patent: 4078212 (1978-03-01), Rast
patent: 4245350 (1981-01-01), Moore
patent: 4379271 (1983-04-01), Lehmann

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