Variable-frequency oscillator configuration

Details Variable-frequency oscillator configuration Variable-frequency oscillator configuration

1996-11-26

1998-04-28

Mis, David

Oscillators

With frequency adjusting means

Step-frequency change

331 36C, 331117R, 331177V, 331181, 334 15, H03B 508

Patent

active

057450137

ABSTRACT:
A variable-frequency oscillator configuration, in particular for tuners, includes a feedback network for an oscillator amplifier. The feedback network contains a series circuit formed by two resonant circuit inductors and a resonant circuit capacitor, connected in parallel with a series circuit formed by a further resonant circuit capacitor and a variable capacitor. A switching device is connected to a coupling node between the two inductors, for short circuiting the first resonant circuit capacitor and the resonant circuit inductor connected thereto under the control of a switching signal. The feedback network can consequently be switched over between two frequency bands and is symmetrical with regard to the high-frequency effect.

REFERENCES:
patent: 3813615 (1974-05-01), Okazaki
patent: 4160213 (1979-07-01), Carter
patent: 4565978 (1986-01-01), Fenk et al.
patent: 4639691 (1987-01-01), Iigima
patent: 5434543 (1995-07-01), Brilka et al.
"Television Technique without Ballast" (Limann et al), Munich, 1983, 14th revised edition, pp. 5 and 90-93.

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