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AssigneeNEC Corporation
InventorsShuzo Fujii, Yuzo Shimada, Kazuaki Utsumi, Yutaka Saito
Estimating the term…
Between insulative layers (31-37, 41-44), a multilayer substrate comprises at least one dielectric layer (26-29). It is possible to form capacitors (58), resistors (46), and wiring conductors (61, 62) in the substrate. The at least one dielectric layer should be of at least one dielectric composition which has a perovskite structure. Preferably, each insulative layer is of an insulating material which consists essentially of aluminum oxide and lead borosilicate glass. The substrate is convenient in manufacturing a crystal oscillator by mounting a crystal vibrator (71) and a transistor (72) on the principal surface(s). Examples of the dielectric composition are: Pb[(Fe.sub.2/3.W.sub.1/3).sub.0.33 (Fe.sub.1/2.Nb.sub.1/2).sub.0.67 ]O.sub.3, Pb[(Mn.sub.1/3.Nb.sub.2/3).sub.0.01 (Mg.sub.1/2.W.sub.1/2).sub.0.30 (Ni.sub.1/3.Nb.sub.2/3).sub.0.49 Ti.sub.0.20 ]O.sub.3, and Pb[(Mg.sub.1/2.W.sub.1/2).sub.0.66 Ti.sub.0.34 ]O.sub.3.
In a monolithic multicomponents ceramic (MMC) substrate comprising at least one dielectric layer which is of at least one composition having a perovskite structure, a plurality of insulative layers on both sides of said at least one dielectric layer, a plurality of resistive films on at least one of said dielectric and said insulative layers, said resistive films being resistors, a plurality of pairs of conductive films on both sides of at least one of said at least one dielectric layer, said pairs of conductive films being capacitors, and a plurality of wiring conductors on and through predetermined ones of said dielectric and said insulative layers to form an electrical circuit together with said resistive films and said pairs.
In a piezoelectric oscillator comprising a monolithic multicomponents ceramic substrate having a pair of principal surfaces, and a piezoelectric oscillation element and an active semiconductor device on at least one of said principal surfaces, said substrate comprising at least one dielectric layer which is of at least one composition having a perovskite structure, a plurality of insulative layers on both sides of said at least one dielectric layer, a plurality of resistive films on at least one of said dielectric and said insulative layers, said resistive films being resistors, a plurality of pairs of conductive films on both sides of at least one of said at least one dielectric layer, said pairs of conductive films being capacitors, and a plurality of wiring conductors on and through predetermined ones of said dielectric and said insulative layers to form an oscillation circuit together with said piezoelectric oscillation element, said active semiconductor device, said resistive films, and said pairs, two of said insulative layers providing said principal surfaces, respectively.
In a piezoelectric oscillator comprising a monolithic multicomponents ceramic substrate having a pair of principal surfaces and a piezoelectric oscillation element, an active semiconductor device, an inductor, and a switch on at least one of said principal surfaces, said substrate comprising at least one dielectric layer which is of at least one composition having a perovskite structure, a plurality of insulative layers on both sides of said at least one dielectric layer, a plurality of resistive films on at least one of said dielectric and said insulative layers, said resistive films being resistors, a plurality of pairs of conductive films on both sides of at least one of said at least one dielectric layer, said pairs of conductive films being capacitors, and a plurality of wiring conductors on and through predetermined ones of said dielectric and said insulative layers so that said wiring conductors form a first oscillation circuit together with said piezoelectric oscillation element, said active semiconductor device, said switch, said resistive films, and said pairs and that said wiring conductors form a second oscillation circuit together with said piezoelectric oscillation element, said active semiconductor device, said inductor, said switch, said resistive films, and said pairs, two of said insulative layers providing said principal surfaces, respectively, said switch being for selectively putting said first and said second oscillation circuits into operation.
Dependencies are inferred from the claim text.