Abstract:
An oscillator assembly includes an oscillator circuit that is configured to generate a frequency signal. A temperature compensation circuit is in communication with the oscillator circuit and adapted to adjust the frequency signal in response to changes in temperature. The oscillator and temperature compensation circuits are located within an oven. A heater and a temperature sensor in communication with the heater are also both located in the oven. The temperature sensor is adapted to directly control the heater in response to changes in temperature. In one embodiment, the oscillator components are mounted to a ball grid array substrate which, in turn, is mounted on a printed circuit board. In this embodiment, a resonator overlies the ball grid array substrate and a lid covers and defines an oven and enclosure for the resonator and the ball grid array substrate. The oscillator and temperature compensation circuit are defined on the ball grid array substrate.
Abstract:
A method for affixing a resonator to a printer circuit board is provided. The method uses a thin metal film which may be affixed to a surface of a stand off, or directly to a surface of a resonator. The metalized surface may be affixed to a printer circuit board using a molten agent with a surface tension which withstands the downward force exerted by the puck's weight. The metalized surface may be affixed to a printed circuit board using a solder paste and the solder is allowed to reflow. The surface tension of the molten solder causes the resonator (or resonator puck) to self-center, ensuring proper placement and eliminating the need for repositioning. Since the resonator is not positioned using traditional glues which are subject to shifting during transportation or curing, then the resonator is not subject to shifting, eliminating the need to reposition the resonator after the resonator become fixed.
Abstract:
A surface mounting package includes a metal base (1) with a lower surface having a through hole, a metal lead (2) arranged to be inserted into the through hole, an insulating material (3) filling in an internal space defined by the metal base (1), a cap (30) covering the metal base (1) as a lid, and an electronic part component arranged at a surface (2i) on the internal space side of the metal lead (2). The internal space is held at an air-tight atmosphere. The metal base (1) has a lower surface positioned on the same plane as a lower surface of the metal lead (2) or the insulating material (3), the same plane (P) forming a plane to be attached to a mounting board.
Abstract:
Dispositif électrique et procédé de fabrication de celui-ci Le dispositif électrique (2, 202) comprend un premier composant électrique (4) et un deuxième composant électrique (6) reliés entre eux par l'intermédiaire d'un moyen de connexion électrique (26) ayant une plaque support (24) électriquement isolante, et un joint de soudure (22) déposé sur la plaque support (24). Le joint de soudure (22) possède une température de fusion (Tf) nettement inférieure à une température ambiante (Ta) de fonctionnement à laquelle est prévu d'être soumis au moins un des deux composants électriques et le moyen de connexion électrique (26). Le dispositif électrique (2) comprend un ciment (28) qui recouvre dans sa totalité le joint de soudure (22) exposé, le matériau du ciment (28) étant choisi pour maintenir son adhésion et son étanchéité vis-à-vis du joint de soudure (22) lorsque la température ambiante (Ta) de fonctionnement est appliquée. Le dispositif électrique (2, 202) comprend un premier composant électrique (4) et un deuxième composant électrique (6) reliés entre eux au travers d'un moyen de connexion électrique (26) ayant une plaque support (24) électriquement isolante, et un joint de soudure (22) déposé sur la plaque support (24). Le joint de soudure (22) possède une température de fusion (Tf) nettement inférieure à une température ambiante (Ta) de fonctionnement à laquelle est prévu d'être soumis au moins un des deux composants électriques et le moyen de connexion électrique (26). Le dispositif électrique (2) comprend un ciment (28) qui recouvre dans sa totalité le joint de soudure (22) exposé, le matériau du ciment (28) étant choisi pour maintenir son adhésion et son étanchéité vis-à-vis du joint de soudure (22) lorsque la température ambiante (Ta) de fonctionnement est appliquée.
Abstract:
An ovenized oscillator package including a ball grid array substrate seated on a circuit board, a heater and a temperature sensor mounted on the ball grid array substrate, and a crystal package mounted to the ball grid array substrate and overlying at least the heater. A layer of thermally conductive epoxy or adhesive material couples the heater to the crystal package. Stabilizer posts, which are made of an insulative adhesive or epoxy material, are formed between the ball grid array substrate and the circuit board for stabilizing and relieving the stress on the ball grid array substrate. A lid is seated on the circuit board and covers and defines an oven for the ball grid array substrate.
Abstract:
The method of surface mounting radio frequency components includes using at least one radio frequency component (300, 810, 850) having a pair of input/output contact points (330, 332, 830, 832, 870, 872) or areas at corners on the underside of the component, wherein each of the input/output contact points or areas abuts the adjoining edges of the corners. The component is positioned relative to a pair of traces (846, 856, 858, 860) on a circuit for enabling an electrical connection thereto in a range of angular dispositions. By using a single non-customized component, adjacent components can be configured with a signal flow path of a range between about 0 degree (a chain configuration) and about 180 degrees (a "U" turn).