Double tuned RF circuit with balanced secondary

Details Double tuned RF circuit with balanced secondary Double tuned RF circuit with balanced secondary

1994-08-08

1997-04-08

Burgess, Glenton B.

Television

Receiver circuitry

Tuning

4551912, 333 25, 334 15, H04N 550

Patent

active

056192835

ABSTRACT:
A band switchable double tuned circuit having a balanced secondary is presented. A primary tunable tank circuit with a plurality of first inductances is tuned to a first frequency by a first capacitor coupled in parallel with the first inductances. A secondary tank circuit with a plurality of second inductances inductively coupled to ones of the first inductances has a second capacitor coupled in parallel with the second inductances for tuning the secondary to the first frequency. The DC reference potential for the secondary circuit, is coupled to a nodal junction of the plurality of second inductances with the secondary tank circuit providing a balanced signal output. At least one of the plurality of first inductances and the second inductances are switchable for bandswitching the tuning of the primary and secondary tank circuits to a second frequency. The output signal from the balanced secondary is coupled to the input of a balanced mixer via constant bandwidth inductances without a mixer input balance transformer.

REFERENCES:
patent: 3962643 (1976-06-01), Ma
patent: 4646360 (1987-02-01), Muterspaugh
patent: 4675634 (1987-06-01), Matsushita et al.
patent: 4749974 (1988-06-01), Yamamoto et al.
patent: 4905306 (1990-02-01), Anderson
patent: 4996599 (1991-02-01), Anderson
patent: 5077543 (1991-12-01), Carlie
patent: 5285179 (1994-02-01), Wignof et al.
Grundig Technische Informationen, vol. 29, No. 3, 1982, pp. 146-151, Lammermann & Rehak; "Pal-Secam-Tuner-ZF-Kobination Fur Das Cuc-Farbfernsehgerate-Chassis" (with translation) (copy of search report).
Elektor Electronics, vol. 14, No. 152, Jan. 1988 p. 69, "Front-end for FM-receiver".

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