Converting capacitance to inductance in a floating resonant

Details Converting capacitance to inductance in a floating resonant Converting capacitance to inductance in a floating resonant

1996-02-08

1998-02-03

Faile, Andrew

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

455144, 4551804, 4551881, 4551912, 4551973, 334 71, H04B 118

Patent

active

057155283

ABSTRACT:
An improved tuner for a varactor-tuned local oscillator in a radio receiver includes a winding of a pair of magnetically coupled inductors, preferably constructed in the form of a transformer. Preferably, the first and second windings are magnetically coupled with reduced inter-winding capacitance by axially separating the windings on a common core. The second winding is selectively coupled by a switch to a capacitive load in order to change the inductance of the first winding. The tuning range of the resonant circuit formed by the varactor diode set and the first winding is changed when the capacitive load is coupled. The magnetic coupling between the transformer windings provides DC isolation between the oscillator and the switching circuit. Preferably, a tuning actuator has overlapping ranges of movement for selection of a signal within both the AM and FM frequency bands as the intermediate frequencies for the local oscillator are generated.

REFERENCES:
patent: 3519939 (1970-07-01), Tashima
patent: 3526859 (1970-09-01), Putzer
patent: 3582791 (1971-06-01), Slavin
patent: 3624514 (1971-11-01), Putzer
patent: 3659206 (1972-04-01), Cooke et al.
patent: 4061981 (1977-12-01), Endres et al.
patent: 4065723 (1977-12-01), Endres et al.
patent: 4628540 (1986-12-01), Hendriks
patent: 4710973 (1987-12-01), Suzuki
patent: 5239699 (1993-08-01), Ecklund
European Search Report, May 21, 1997.

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