Varactor diode tuner with band switched coils and lines

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency

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Details

455188, 455195, 334 15, 334 45, 334 56, H03J 524

Patent

active

047109734

ABSTRACT:
A tuner in which a band switching signal corresponding to a channel selected from a plurality of UHF and VHF bands is generated to enable the formation of a suitable resonant circuit for receiving television signals of the selected channel. It includes a varactor diode, a plurality of resonant coils and distribution constant lines which are each grounded at one end. Each of the coils and the line is provided for forming a resonant circuit for tuning one of the bands. A plurality of switching diodes are provided for connecting the other ends of the coils and the line selectively to the other end of the varactor diode. The tuner further includes a device for turning on and off the switching diodes selectively in response to the band switching signal.

REFERENCES:
patent: 3400345 (1968-09-01), Oloff
patent: 3526859 (1970-09-01), Putzer
patent: 3564423 (1971-02-01), Putzer
patent: 3569850 (1971-03-01), Wegner et al.
patent: 3980957 (1976-09-01), Putzer
patent: 4247953 (1981-01-01), Shingawa et al.

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