Shielded VCO module having trimmable capacitor plate external to

Details Shielded VCO module having trimmable capacitor plate external to Shielded VCO module having trimmable capacitor plate external to

1996-06-10

1997-08-05

Grimm, Siegfried H.

Oscillators

With electromagnetic or electrostatic shield

331 68, 331177R, 257708, 257730, 361763, H03B 100

Patent

active

056546769

ABSTRACT:
A voltage controlled oscillator module (100) (400) provides tuning capability for the VCO in a shielded environment. The module includes a trimmable capacitor (110) (410) having metal plates (112, 114), (412, 414, 416) capacitively coupled through the substrate. One of the metal plates (114) (416) is a trimmable plate which can be trimmed to tune the VCO frequency. The trimmable metal plate (114) (416) remains exposed on the bottom surface (108) (408) of the substrate (104) (404) so that the frequency of the VCO can be tuned while the reminder of the oscillator circuitry (102) (402) on the top surface (106) (406) is encapsulated by a ground shield (116) (418).

REFERENCES:
patent: 3969640 (1976-07-01), Staudte
patent: 5172077 (1992-12-01), Funada

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