RF capacitor circuit and method of electronically tuning same

Details RF capacitor circuit and method of electronically tuning same RF capacitor circuit and method of electronically tuning same

1996-12-24

1998-11-24

Gensler, Paul

Tuners

With switching means

Capacitor only modified or substituted by switching

3612752, 361329, H03J 524

Patent

active

058413340

ABSTRACT:
An RF capacitor circuit having a plurality of capacitors and a method of electronically tuning such circuit is disclosed. The method includes the steps of connecting the capacitors in parallel relation so as to have common nodes and electronically eliminating any number of the capacitors in order to obtain a desired total capacitance for the circuit. The method further includes either connecting a fuse in series relation with each capacitor, wherein each fuse has a designated current rating above which it prevents current from passing to its associated capacitor, or providing each capacitor with a unique breakdown voltage/current. Thus, when a voltage is provided to an input of the circuit, either the current rating of a designated number of fuses or the breakdown voltage/current of a designated number of capacitors is exceeded. Such capacitors are then electronically eliminated and the circuit is tuned to the desired total capacitance. It is preferred that the current rating of the fuses or the breakdown voltage/current of the capacitors range from a minimum value to a maximum value.

REFERENCES:
patent: 1937099 (1933-11-01), Stewart
patent: 3231701 (1966-01-01), Craig
patent: 4216451 (1980-08-01), Nishimura et al.
patent: 4442473 (1984-04-01), Holtzmann et al.
patent: 4890063 (1989-12-01), Haragashira
patent: 5473291 (1995-12-01), Brownley

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