Abstract:
A resonator package includes a quartz resonator and a heating element within a sealed housing, wherein the heating element is thermally coupled to an external wall of the housing. The heated external wall of the housing is thermally coupled to a substrate to heat a local region of the substrate. The heated local region of the substrate thermally stabilizes an associated oscillator control circuit and heater control circuit which are external to the housing.
Abstract:
An insulating substrate (1) comprises a first insulating substrate (1a) and a second insulating substrate (1b) stacked on the first insulating substrate (1a). On both substrates (1a, 1b) formed are wiring patterns and electrodes. A recess is defined by the opening (4) made in the first insulating substrate (1a) and by the upper face of the second insulating substrate (1b). Wirings (15 and 18) are arranged on the upper face of the second substrate (1b) in the area corresponding to the bottom of the recess. Consequently, the space where the wirings are provided is wide and the distance between the conductors (15 and 18) is long. In addition, the wirings are away from the external electrodes provided on the lower face of the second substrate (1b). Therefore, the parasitic capacitances between the electrodes and wirings and between the wirings are reduced.
Abstract:
A piezoelectric resonator (12) is embedded within an electrically insulating substrate assembly (36), such as a multilayer printed circuit board. Electrical conductors (22, 24) extend from electrodes of the resonator (12) through holes (32) in upper and lower layers (26, 29) of the substrate assembly (36) and connect to electrical traces (34). The lower layer (29) has a pocket which forms a cavity (38) within the substrate assembly (36) adapted to contain the piezoelectric resonator (12). The conductors (22, 24) support the resonator (12) such that the resonator (12) does not contact the assembly (36). As the resonator is substantially larger than associated electrical components, embedding it within a substrate eliminates the size penalty that is normally required to mount a large piezoelectric resonator.
Abstract:
A piezoelectric resonator constituted in one body of an ultrathin vibrating part and a thick annular enclosing part surrounding the vibrating part, in which a groove for an excess adhesive agent, etc., is formed between an appropriate area which is a portion of the surface of the annular enclosing part and on which adhesive is applied, and the inner periphery of a recessed part facing the area, adhesive is applied in the z-axis direction on the peripheral surface of the annular enclosing part to hold the resonator in a package, the resonator is held in the package not by the adhesive but by an elastic claw, or one peripheral part of the annular enclosing part being the surface opposed to a pad positioned in one peripheral part on one of the surfaces of the piezoelectric resonator is bonded to the inner bottom surface of the package. Owing to the holding structures, change of the resonance frequency of the piezoelectric vibrating plate which is caused by flowing of the adhesive into the recessed part is prevented, variation of the temperature-frequency characteristic of the resonator held in the package which is caused in the case of mass production is reduced, and the mechanical strength of the electrical connection by bonding of the piezoelectric resonator incorporated in the package can be improved too.
Abstract:
Hybrid filters and more particularly filters having acoustic wave resonators (AWRs) and lumped component (LC) resonators and packages therefor are described. In an example, a packaged filter incudes a package substrate, the package substrate having a first side and a second side, the second side opposite the first side. A first acoustic wave resonator (AWR) device is coupled to the package substrate, the first AWR device comprising a resonator. A plurality of inductors is in the package substrate.