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Surface mounted component UHF oscillator
| Details |
Inventors: Cruz, Michael S.; Vaughter, Harmon P.;
Assignee: Zenith Electronics Corporation (Glenview, IL)
Primary Examiner: Grimm; Siegfried H.
Assistant Examiner:
Attorney, Agent or Firm:
A UHF oscillator circuit includes a plurality of first leadless, or "chip", surface mounted components machine positioned on a first side of a printed circuit (PC) board and a plurality of second lead-bearing components mounted on a second side of the PC board and coupled in circuit through the PC board to the chip components in an arrangement which substantially reduces circuit fabrication costs. Comprised of a majority of automatically positioned surface mounted chip components and making use of a minimum number of lead mounted discrete components, the low Q values of the surface mounted components are compensated for by an external surface mounted feedback capacitor coupled across the collector-emitter junction of a common base transistor to provide oscillator tuning over a frequency range greater than an octave. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG.
1, there is shown an exploded perspective view of an RF tuner 10 which includes a UHF local oscillator circuit in accordance with the present invention.
The RF tuner 10 includes a top panel 12 having a plurality of elongated slots 12a adjacent to the periphery thereof.
The RF tuner 10 further includes a bottom panel 14 having a plurality of coupling arms 14a extending upward therefrom adjacent to the periphery thereof.
Each of the coupling arms 14a is adapted for insertion within a respective slot 12a in the top panel 12 for securely coupling the bottom panel 14 to the top panel in a spaced arrangement.
Positioned intermediate the top panel 12 and the bottom panel 14 is a metal frame 20 which is sectioned off into various compartments as shown in the figure.
Mounted to a lower portion of the metal frame 20 is a printed circuit (PC) board 32 upon which are positioned various electronic components and conductors.
An upper RF shield 16 is positioned between the top panel 12 and an upper portion of the metal frame 20.
Similarly, a lower RF shield 18 is positioned between the bottom panel 14 and a lower portion of the metal frame 20.
When thus assembled, the metal frame and panels provide an enclosed structure within which are positioned the various electronic components which comprise the tuner circuitry.
The present invention is directed to a unique configuration for a UHF oscillator, a portion of the circuitry of which is positioned within an oscillator compartment 22 within the metal frame 20.
The oscillator compartment 22 is defined by an outer wall 24, first and second intermediate walls 26, 28, and an inner wall 30 of the metal frame 20.
The bottom portion of the oscillator compartment 22 is defined by an upper surface of the PC board 32, while an upper portion of the oscillator compartment is defined by the upper RF shield 16.
The metal frame 20 as well as the top and bottom panels 12, 14 are preferably comprised of metal for rigidity and strength
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Control Computers 
