Double-tuned circuit

Details Double-tuned circuit Double-tuned circuit

1987-01-22

1988-06-07

Gensler, Paul

Tuners

With switching means

Inductor only modified or substituted by switching

334 15, 334 89, H03J 524

Patent

active

047499745

ABSTRACT:
A double-tuned circuit is provided of the type comprising a primary tuning circuit including first and second resonance coils connected in series and a first switching diode interposed between the connection point of the first and second resonance coils and the ground, and a secondary tuning circuit including third and fourth resonance coils connected in series and inductive-coupled with the first and second resonance coils, respectively, and a second switching diode interposed between the connection point of the third and fourth resonance coils and the ground, wherein band switching is preformed by turning on/off both the first and second switching diodes, which is characterized in that a bias voltage for turning on the first and second switching diodes is supplied to one of the switching diodes and through a conductive wire inductive-coupled with a sintered magnetic material to the other of the switching diodes, whereby an enlargement of the bandwidth and degradation of the flatness of the passband characteristic can be suppressed even with an increase of a receive channel frequency.

REFERENCES:
patent: 2953756 (1960-09-01), Lafferty
patent: 3566277 (1971-02-01), Von Fange et al.
patent: 3611154 (1971-10-01), Kupfer
patent: 3903487 (1975-09-01), Maier
patent: 4291290 (1981-09-01), Ijichi et al.

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